APA (7th ed.) Citation

Ellis, R. S. (1928). The psychology of individual differences. D. Appleton and Company.

Chicago Style (17th ed.) Citation

Ellis, Robert Sidney. The Psychology of Individual Differences. New York, London: D. Appleton and Company, 1928.

MLA (9th ed.) Citation

Ellis, Robert Sidney. The Psychology of Individual Differences. D. Appleton and Company, 1928.

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