APA (7th ed.) Citation

James, W., Burkhardt, F., Bowers, F., & Skrupskelis, I. K. (1981). The principles of psychology. Harvard University Press.

Chicago Style (17th ed.) Citation

James, William, Frederick Burkhardt, Fredson Bowers, and Ignas K. Skrupskelis. The Principles of Psychology. Cambridge, Mass.: Harvard University Press, 1981.

MLA (9th ed.) Citation

James, William, et al. The Principles of Psychology. Harvard University Press, 1981.