APA (7th ed.) Citation

Helson, H. 1. . . . ., & Bartley, H. S. (1951). Theoretical foundations of psychology. Van Nostrand.

Chicago Style (17th ed.) Citation

Helson, Harry 1898- , and Howard S. Bartley. Theoretical Foundations of Psychology. New York: Van Nostrand, 1951.

MLA (9th ed.) Citation

Helson, Harry 1898- , and Howard S. Bartley. Theoretical Foundations of Psychology. Van Nostrand, 1951.