A credible source is one that the reader can trust. It is a good idea to create your bibliography and use the Citation Generator below to build your list.
https://www.easybib.com/guides/citation-guides/apa-format/annotated-bibliography-format-apa/
If you are going to create an annotated bibliography, it is important to sift through your sources; and make sure that they meet the credibility requirements. Read this website about evaluating sources to help you with this task.
https://owl.english.purdue.edu/owl/resource/553/01/
The hardest type of material to evaluate is the website, journal or electronic resource. There are several evaluative tools that can be used to evaluate websites. Here are links to those two tests:
The CRAAP Test
https://www.csuchico.edu/lins/handouts/eval_websites.pdf
The CARP Test