Cita APA (7a ed.)

Hollingworth, H. L. (1928). Psychology: Its facts and principles. D. Appleton and Company.

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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