References can be:
Most scholarly - extensive list of scholarly sources
Mid-level - list of credible/reliable sources; sources mentioned in the text
Low-level - no references
For a source you're considering: Where do the references fall on a scale of 0 to 10?
Where to look for references:
Books: At the end of chapters, in footnotes, or at the end of the book.
Articles: At the end of the article, or mentioned within the article
Websites: At the end of the webpage, or mentioned within the webpage.
In addition to looking for a list of references, look at the references themselves:
- are the references scholarly sources?
- are the references up-to-date? (does that matter for your topic?)