APA (7th ed.) Citation

Hollingworth, H. L., & Poffenberger, A. T. (1921). Applied psychology. D. Appleton.

Chicago Style (17th ed.) Citation

Hollingworth, Harry Levi, and Albert Theodor Poffenberger. Applied Psychology. New York: D. Appleton, 1921.

MLA (9th ed.) Citation

Hollingworth, Harry Levi, and Albert Theodor Poffenberger. Applied Psychology. D. Appleton, 1921.

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