APA (7th ed.) Citation

Poffenberger, A. T. (1942). Principles of applied psychology. Appleton-Century.

Chicago Style (17th ed.) Citation

Poffenberger, Albert Theodor. Principles of Applied Psychology. New York: Appleton-Century, 1942.

MLA (9th ed.) Citation

Poffenberger, Albert Theodor. Principles of Applied Psychology. Appleton-Century, 1942.