APA (7th ed.) Citation

Gale Group & Krapp, K. M. (2005). Psychologists and their theories for students. Thomson Gale.

Chicago Style (17th ed.) Citation

Gale Group and Kristine M. Krapp. Psychologists and Their Theories for Students. Detroit, Mich: Thomson Gale, 2005.

MLA (9th ed.) Citation

Gale Group and Kristine M. Krapp. Psychologists and Their Theories for Students. Thomson Gale, 2005.