APA Style

Olson, M, H., Hergenhahn, B. (2007). An Introduction to theories of personality, 7th ed (7). London: Pearson Education, Inc.

MLA Style

Olson, Matthew, H.., Hergenhahn, B.R.. "An Introduction to theories of personality, 7th ed". 7 London: Pearson Education, Inc, 2007. Text.