Most psychology materials fall into the 150 call number range.
Keep in mind that this is not the only place that these materials will be located. Other subjects may have material of interest as well.
It's usually best to start with a keyword search, but subject headings applied to relevant books can help to refine your results. Open the item record of a book that interests you. Scroll down to the clickable subject headings, and run another search to explore similar books.
You can also browse the headings associated with a particular topic as a way of getting started with your research.