APA (7th ed.) Citation

Keller, F. S. (1950). Principles of Psychology. Appleton-Century-Crofts.

Chicago Style (17th ed.) Citation

Keller, Fred S. Principles of Psychology. Appleton-Century-Crofts, 1950.

MLA (8th ed.) Citation

Keller, Fred S. Principles of Psychology. Appleton-Century-Crofts, 1950.

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