Cita APA (7a ed.)

McDougall, W. (1931). An introduction to social psychology (22nd ed., enl.). Methuen.

Cita Chicago Style (17a ed.)

McDougall, William. An Introduction to Social Psychology. 22nd ed., enl. London: Methuen, 1931.

Cita MLA (9a ed.)

McDougall, William. An Introduction to Social Psychology. 22nd ed., enl. Methuen, 1931.