NUsearch is the library's online catalog that can help you find items held by all the Northwestern libraries such as the Main Library in Evanston, Schaffner (Chicago campus), Galter Health Sciences Library, and the Pritzker Law School Library.
The most useful subject headings for your research may include:
Clinical Trials as Topic
Clinical Trials as Topic--Methods
Clinical Trials as Topic--Standards
Research Design (Medical subject heading)
Human Experimentation in Medicine