Cita APA (7th ed.)
Langfeld, H. S. (1946). Wiley Books in psychology. Wiley.
Cita Chicago (17th ed.)
Langfeld, Herbert Sidney. Wiley Books in Psychology. New York: Wiley, 1946.
Cita MLA (9th ed.)
Langfeld, Herbert Sidney. Wiley Books in Psychology. Wiley, 1946.
Atenció: Aquestes cites poden no estar 100% correctes.