Lefton, L. A. (1994). Psychology (5th.ed.). Allyn and Bacon.
Cita Chicago (17th ed.)Lefton, Lester A. Psychology. 5th.ed. Boston: Allyn and Bacon, 1994.
Cita MLA (9th ed.)Lefton, Lester A. Psychology. 5th.ed. Allyn and Bacon, 1994.
Atenció: Aquestes cites poden no estar 100% correctes.