Bibliographies, or lists of sources, can be a useful starting point for your research. Oxford Bibliographies Online (OBO) is a database that contains bibliographies on almost any subject with recommendations for scholarship at all levels, whether encyclopedias and textbooks or journal articles and primary sources. For each topic in OBO, you'll find bibliographic essays and annotated citations. The content is selective and peer-reviewed, chosen by experts in their disciplines.
The first two links below go to specific topics in Oxford Bibliographies Online that may be particularly useful for this course because they focus on History. You may also wish to search the entire OBO database (third link below) using terms such as: madness, insanity, mental health, mental illness, psychology, psychiatry, etc.