University and College libraries subscribe to databases which have had their contents vetted. This means any of those listed on the Detroit Mercy libraries website are good sources. We include a link to the Directory of Open Access Journals (DOAJ). There are also some directories such as Cabell's, a resource which is specific to business journals.
It is also helpful to consult WorldCat, which will confirm the journal has a history, and has been cataloged by a library. Some WorldCat records will also list were a specific journal is indexed.
Students: If uncertain about a source ask a librarian or your professor.
Faculty: Ask a mentor, other senior faculty, or a librarian if a journal seems dubious.
These are websites put up by entities which claim to be legitimate peer-reviewed journals, but are really a means to separate the unwary or desperate from their money. Unfortunately, these sites also can have a negative effect for those seeking tenure and promotion.
Like some good predators in nature, they are adept at mimicry; they may appear at first to be a real peer-reviewed or scholarly journal site. Condensed from Beall's List and other sources; here are some ways to tell if you are looking at such a site:
As of January 17, 2017 Beall's List of Predatory Publishers has been taken down. Stay tuned and stay skeptical.
Beall's List as of January 15, 2017 is available at the Internet Archive:
These journals are picked up by Google Scholar, so be aware.
Hymenopus coronatus (Orchid Mantis)