APA (7th ed.) Citation

McDougall, W. (1925). An introduction to social psychology (Twenthieth edition, enlarged.). London: Methuen & Co.

Chicago Style (17th ed.) Citation

McDougall, William. An Introduction to Social Psychology. Twenthieth edition, enlarged. London: Methuen & Co, 1925.

MLA (8th ed.) Citation

McDougall, William. An Introduction to Social Psychology. Twenthieth edition, enlarged. London: Methuen & Co, 1925.

Warning: These citations may not always be 100% accurate.