APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

O'Neil, W. M. The Beginnings of Modern Psychology / by W.M. O'Neil. Penguin Books, 1968.

MLA (9th ed.) Citation

O'Neil, W. M. The Beginnings of Modern Psychology / by W.M. O'Neil. Penguin Books, 1968.

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