APA (7th ed.) Citation

Spencer, H. (1910). The principles of psychology. D. Appleton & Co..

Chicago Style (17th ed.) Citation

Spencer, Herbert. The Principles of Psychology. New York, N.Y.: D. Appleton & Co., 1910.

MLA (8th ed.) Citation

Spencer, Herbert. The Principles of Psychology. D. Appleton & Co., 1910.

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