Biopsychology is the approach of explaining human behaviour as a result of biological mechanisms. It can include genetic, hormonal, and neurotransmitter approaches, as well as the physiology of the human brain.
Kalat (2006). Cram101 Textbook Outlines to accompany: Biological Psychology by 8th Edition. ISBN 142880210X
Toates,F. and Stein, S.(2003) Biological Psychology: an Integrative Approach" with "Psychology on the Web: A Student Guide" (Paperback) ISBN 0582821282