Books are shelved in general subject categories using the Library of Congress classification system. You may want to supplement your use of the catalog with browsing shelf areas for your topic. Below is a brief listing of some of the subject locations in the field of field of psychology.
BF Psychology
RC 321-571 Neurosciences. Biological psychiatry. Neuropsychiatry
RC 435-571 Psychiatry
Sometimes people shy away from books because they are longer to read than a journal article. Many disciplines still publish current research in books, so you don't want to miss out on key resources by ignoring books. There are some tricks you can use to understand a book's structure and argument, so you DON'T have to read the whole thing.
Once you have a good idea of the book's structure and argument through skimming, you can narrow in on the portions of the text most useful for your research.
The Cambridge Handbook of Forensic Psychology by 
Colonialism and the COVID-19 Pandemic: Perspectives from Indigenous Psychology by 
Introduction to Psychology by 
Lacan and Race: Racism, Identity, and Psychoanalytic Theory by 
The Psychology of Women and Gender by 
Research Methods in Psychology by 
The Sociology of Bullying: Power, Status, and Aggression Among Adolescents by This work is licensed under CC BY-NC-SA 4.0
