A website of a governmental organization (U.S. Food and Drug Administration, The Office of Animal Health and Food Safety,etc.)
A website of a relief organization that might collect its own data (USAID, UNICEF, MSF, etc.
b) What a credible source is NOT…
A newspaper or magazine article (Newspaper and magazine articles are NOT peers in the discipline and they are not journals.)
Content posted in a .com (...usually – there are some exceptions.) An editorial, commentary, book review, or abbreviated article in a journal. (Not all articles in a peer reviewed journal are peer-reviewed)
Ulrich’s Serial Analysis System: identifying journals that contain peer-reviewed literature.
A blog (Content is based on opinions.)
Content from Wikipedia (any person can post to Wikipedia)