APA (7th ed.) Citation

O'Neil, W. M. (1968). The beginnings of modern psychology (1. publ.). Penguin Books.

Chicago Style (17th ed.) Citation

O'Neil, W. M. The Beginnings of Modern Psychology. 1. publ. Harmondsworth: Penguin Books, 1968.

MLA (9th ed.) Citation

O'Neil, W. M. The Beginnings of Modern Psychology. 1. publ. Penguin Books, 1968.

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