"Course will also include a brief research project focusing on the subject of writing itself preparing students for longer, more complicated research projects." (from Course Description on page one of the syllabus)
"This is a short writing project (usually about four pages), involving finding and summarizing three sources on their chosen subject." (email from Professor Taylor)
What types of information sources does Professor Taylor want you to find?
"Find three sources on your chosen subject." (from Week #11 in the syllabus)
What does "three sources on your chosen subject" mean?
Well, the paper is about four pages long.
This suggests that you will look for journal articles about your subject, rather than books.
You can use parts of three articles successfully in a four page paper.
You will not have too much or too little information.