The credibility of a journal may be assessed by examining several key factors.

The Impact Factor is a statistical measure used to compare journals in a given field.

The H-Index is a popular tool for determining relative impact of an author's work by qualifying an author's cited publications.

The National Institutes Health (NIH) Public Access Policy (Public Law 110-161) requires that any peer-reviewed manuscript resulting in whole or in part from direct funding paid by the NIH or NIH staff must be submitted in electronic format to the National Library of Medicine's digital archive, PubMed Central (PMC), and made publicly available within twelve months of publication.

Identify available funding from United States federal departments and centers; explore detailed application guidelines for more than 7,000 grants and a searchable file of approximately half a million grants.

Examples of grey literature include reports, theses, dissertations, official documents, informal communication, research-in-progress, or clinical trials produced by government agencies, academic institutions, or business. Grey literature is not controlled by commercial or academic publishers and is not peer-reviewed.