Home › Authors › Mary Trahan 👤 Mary Trahan 4 books Books by Mary Trahan Psychology , Study Guide & Introductory Psychology Video Toolkit Cd-Rom 2007 Psychology, Fourth Edition & PsychInquiry & Study Guide 2004 Psychology, 43 & Study Guide & Psychology, 43 & Study Guide & Scientific American Explores The Hidden Mind 2002 Focus on Psychology 1998