Psychology : its facts and principles

MLA

Hollingworth, Harry Levi. Psychology : Its Facts and Principles. New York: Appleton, 1928.

APA

Hollingworth, H. Levi. (1928). Psychology : its facts and principles. New York: Appleton.

Chicago

Hollingworth, Harry Levi, Psychology: Its Facts and Principles. New York: Appleton, 1928.