Landy, F. J. (1987). Psychology: The science of people (2nd.ed.). Prentice - Hall.
Cita Chicago (17th ed.)Landy, Frank J. Psychology: The Science of People. 2nd.ed. New Jersey: Prentice - Hall, 1987.
Cita MLA (9th ed.)Landy, Frank J. Psychology: The Science of People. 2nd.ed. Prentice - Hall, 1987.
Atenció: Aquestes cites poden no estar 100% correctes.