The main collection for psychology is held on level 0 in the BF callmark area. Psychology is a diverse and interconnected discipline so books relevent to psychology will also be shelved in other parts of the library.
Remember, the library has many Ebooks which are not on the shelves.
If you are unfamiliar with your topic, learn more by browsing these encyclopedias and handbooks.
Try these resources to find New Zealand material which is often not included in international databases.
These websites contain free content suitable for academic study. Let me know if you have a favourite psychology website and I'll consider adding it to the list.