Attached, the feedback from the proposal paper you wrote about Putin from my Professor.
I would like to see your initial working bibliography up to this point in the term. The difference between a reference page, works cited, or what one puts in a footnote and a bibliography is scope. The former are all sources that one has cherry-picked and decided to use in some manner directly in the paper.
The bibliography represents the total research effort, and includes corroborating sources, sources that are relevant to the topic that you perused but did not use, or other key documents relative to the overall paper that may have had any influence on your choices and your prose. While there is no magic numbers, my rule of thumb is a good paper generally will have at a 2+:1 ratio between what one has in the bibliography and what one cites in the paper.
I don’t set limits as this is not a real world skill. But I do have graduate expectations. For a paper that will have to have some depth, just a few sources is going to be inadequate, so don’t limit yourself, but at the same time don’t pad or add fluff just to add numbers.
This can be an annotated bibliography, or just an alphabetical listing of your research to date. It is your choice.