APA (7th ed.) Citation

James, W. (1971). The principles of psychology. Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

James, William. The Principles of Psychology. Chicago [etc.]: Encyclopaedia Britannica, 1971.

MLA (9th ed.) Citation

James, William. The Principles of Psychology. Encyclopaedia Britannica, 1971.

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