APA (7th ed.) Citation

Hollingworth, H. L. (1928). Psychology, its facts and principles. D. Appleton.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Hollingworth, Harry L. Psychology, Its Facts and Principles. D. Appleton, 1928.

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