APA (7th ed.) Citation

McDougall, W. (1948). An outline of psychology (12. ed.). Methuen.

Chicago Style (17th ed.) Citation

McDougall, William. An Outline of Psychology. 12. ed. London: Methuen, 1948.

MLA (9th ed.) Citation

McDougall, William. An Outline of Psychology. 12. ed. Methuen, 1948.