Spencer, H. (1910). The principles of psychology. D. Appleton & Co..
Chicago Style (17th ed.) CitationSpencer, Herbert. The Principles of Psychology. New York, N.Y.: D. Appleton & Co., 1910.
MLA (8th ed.) CitationSpencer, Herbert. The Principles of Psychology. D. Appleton & Co., 1910.
Warning: These citations may not always be 100% accurate.