APA (7th ed.) Citation

Murphy, G., & Spohn, H. E. (1951). An introduction to psychology. Harper.

Chicago Style (17th ed.) Citation

Murphy, Gardner, and Herbert E. Spohn. An Introduction to Psychology. New York: Harper, 1951.

MLA (9th ed.) Citation

Murphy, Gardner, and Herbert E. Spohn. An Introduction to Psychology. Harper, 1951.