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How to Spot a Predatory Publisher
Do your homework when considering an invitation to publish or serve as a reviewer. Who is it that's asking for your scholarship or your time, and what are their practices? Don't wait to find out until it's too late.
Pay attention to who publishes the journals you're considering; reach out to colleagues listed as authors, editors, or reviewers before you commit to anything to verify their affiliation with the journal or publisher. An illegitimate publisher will often list people as editors or reviewers without their consent.
Review the easy guidelines at Think. Check. Submit.
Other sources for vetting Publishers
DOAJ's Publishing best practice and standards for inclusion.
Principles of Transparency and Best Practice in Scholarly Publishing, jointly published by OASPA, COPE, DOAJ and WAME. Reputable open access publishers are often members of one or more of these organizations.
Ulrich's Periodicals Directory provides detailed information about periodicals of all types, including information about peer review and abstracting and indexing.