The following definitions refer to published or recorded information, where the information is put in a (reasonably) permanent form.
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Primary sources, secondary sources, and tertiary sources as definitions deal with Critical pieces are
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Primary sources, secondary sources, and tertiary sources as definitions look at the phenomenon or idea or research study and whether the person reporting about it created it themself or experienced it firsthand or witnessed it by being physically present and seeing it or whether they learned of it secondhand or thirdhand. (In other words, the relationship of the person to the phenomenon. Were they present?)
The phenomenon, idea, or research study always has a time period when it occurred, was created, or was under development. This may be either a specific moment in time (For example, March 14, 2015, at 9:26 AM EDT) or a range of time (the entire time period spanning World War II).
This might make more sense when you look at examples.
If the wife of the president writes a book which is about herself and is also about her husband the president,
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PHENOMENON |
GRAY SOURCE |
PRIMARY SOURCE |
SECONDARY SOURCE |
TERTIARY SOURCE |
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Information about a person |
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Autobiography; personal diary or journal |
Biography; source about the person authored by a different person |
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Event of the Gettysburgh Address speech by Abraham Lincoln, Nov. 19, 1863 |
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Transcript of the speech by President Lincoln; a photograph of the event; eyewitness account of the event |
News report by a newspaper journalist; commentary |
History textbook entry about the event |
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Research study |
e-mail about the research study by the researcher(s) |
Original article about the research study by the researcher(s) themselves |
article by person who did not do the research which mentions this research study |
Reference book entry about the research topic which mentions studies about the topic, including this study |
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Work of art |
Unpublished personal letter by the artist mentioning this artwork or its development |
The work of art itself; writings by the artist about the artwork |
Article critiquing the artwork not authored by the artist |
Art book entry which includes mention of this artwork |
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Data |
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Original dataset |
Research article which discussed the data or used the data from the dataset |
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The following definitions refer to published, available information where the information is put in a (reasonably) permanent form.
A Primary Source is an original source that first reported a phenomenon, idea, or research study as reported by the person(s) who developed the idea or who did the research or who was present.
The key feature of a primary source is that it is a firsthand account. OR it is original evidence of the phenomenon itself.
Primary sources may include newspaper articles, research reports, trade journal articles, conference proceedings, dissertations, Web sites, novels, poems, plays, speeches, interviews, letters, case studies, test data, findings from surveys, archaeological drawings, experiments, films, drawings, designs, paintings, music, sculptures, etc. IF the source is the *original* source of information as told by a person who did it or developed it or observed it or experienced it.
Primary sources can vary by discipline. But a primary source is always an original source by someone who was there at that place and time.
In history, a primary source would be a paper, video, or recording of an event of interest. It would be a published paper or recorded audio by someone who was there and witnessed the event. It would be a video or photograph of the event. So you would be getting a first person account of the event.
In art and the creative disciplines, a primary source would be the work of art itself or it would be a writing or visual work about the artwork by the artist themself. If the phenomenon in question is the creative work itself, then a primary source would be the original artwork, novel, poem, play, musical composition, painting, sculpture. If the phenomenon in question is a performance of a creative work, then the primary source would be the musical performance by the musicians performing.
In science and medicine, a primary source is an original research study as written/told by the original researchers. Therefore, a primary source is a report of a research study by the researchers who did the research. Someone who watched the experiment but did not participate usually does not count. Researchers most often publish their research projects in scholarly peer-reviewed journal articles of their discipline. But some original research studies may be shared via other sources, such as government reports or conference presentations.
Secondary Sources are resources that analyze, describe, comment on, and synthesize the primary or original source. So they are sources that are about someone's else's original work, observations, writings, etc.
These include review articles, newspaper articles, books or other sources not authored by the author of the original source.
Some professors and scholars include in the definition of secondary sources textbooks and reference books, such as encyclopedias and dictionaries. (See the definition of Tertiary Sources below.)
There is some disagreement among experts regarding the distinction between secondary sources and tertiary sources. But because you may encounter the phrase "tertiary source," it helps to know what is meant.
Tertiary sources are resources written about the secondary literature. In other words, literature which explains, teaches you how to use, and leads you through the vast array of primary and secondary scientific literature. Examples may include textbooks, monographs, bibliographies, encyclopedias and reference books of all kinds which provide a summary of accepted knowledge about a topic or subject area in broad outline. Librarians disagree on the precision of this definition and some do not use the term at all, preferring categories of only primary and secondary sources. But when they do use the phrase "tertiary source," this is what they mean.
What is "gray literature?" (Or the British spelling "grey.") Gray literature is information that has not been formally published and, therefore, is unavailable or hard to find. A good analogy is “as a shadow which has not yet acquired substance”. Also called “fugitive literature,” it usually refers to knowledge that is out in the world but has not yet been formally written down and distributed. For example, researchers may discuss a research study with colleagues and references may turn up in that person's paper but the original study itself is not available in a permanent form. Sometimes the information in gray literature never becomes available to you! For example, if a pharmaceutical company is researching a new drug and doesn’t distribute the information outside of its own employees because it doesn’t want to help the competition. Or a researcher never bothers to publish their research findings for some reason.
Gray literature publications include theses, conference proceedings, technical specifications and standards, non-commercial translations, bibliographies, technical and commercial documentation, government documents, and reports (pre-prints, preliminary progress and advanced reports, technical reports, statistical reports, memoranda, state-of-the art reports, market research reports, etc.). (Alberani, 1990)
The Grey Literature Report of the New York Academy of Medicine notified subscribers of gray literature publications in health services research and selected public health topics from 1999-2016. You can search their Grey Literature Collection as if you were searching a library catalog. Records of results of interest would have to be retrieved like any other book. It also listed organizations that publish grey literature.
