I found all of these books via the Chapters website.
- Schaum's Outline of Introduction to Psychology Author: Arno F. Wittig
- Seven Pioneers of Psychology: Behaviour and Mind Author: R. Fuller
- Research Methods In Psychology For High School Students Author: Jennie Brooks Jamison
- Psychology and You, Student Edition Author: McGraw-Hill (Anything by McGraw-Hill is a good book. They don't publish crappy material)
- Understanding Psychology, Student Edition Author: McGraw-Hill
- Images of Society: Intro to Anthropology, Psychology and Sociology Author: Charles Hawkes
- Understanding Psychology, Interactive Student Edition Author: McGraw-Hill
- The Complete Idiot's Guide To Psychology; Author: Psy Johnston (Christina's personal note: I actually own this book, and I LOVE it. I recommend everyone own it if they're a psychology student or interested. It's an easy read)
- Discovering Psychology 2e High School Edition & Study Guide Author: Don Hockenbury
- Psychiatry for Beginners Illustrator: Bernard Canavan
- The Origin And Development Of Psychoanalysis Author: Sigmund Freud (Everyone should read some Freud, even to gain a healthy dislike for his theories)
- Clinical Psychiatry Essentials Author: Thomas W Roberts
- Kaplan and Sadock's Concise Textbook of Clinical Psychiatry Author: Benjamin J Sadock, Virginia A Sadock
- Introductory Textbook of Psychiatry Author: Dr. Nancy C. Andreasen, Dr. Donald W. Black
- Philosophy, Psychology And Psychiatry Author: A. Phillips Griffiths
- Crash Course (US): Psychiatry: With STUDENT CONSULT Online Access Author: Jonathan Birnkrant, Andrea Carlsen
- Mending Minds: A Guide to the New Psychiatry of Depression, Anxiety, and Other Serious Mental Disorders Author: Leonard L. Heston
- Comfortably Numb: How Psychiatry Is Medicating A Nation Author: Charles Barber
- The Perspectives of Psychiatry Author: Paul R. Mchugh, Phillip R. Slavney
All of the following books are actual textbooks/material for university level classes, but introductory books so they're a fairly easy read.
- Psychology: Themes etc. Author: Weiten
- Fundamentals of Social Psychology Author: Aronson
- Personality Psychology Author: Larsen
- Abnormal Psychology Nolen-Hoeksem