Lefrancois, G. R. (1980). Psychology. Wadsworth.
Cita Chicago (17th ed.)Lefrancois, Guy R. Psychology. Belmont, Calif: Wadsworth, 1980.
Cita MLA (9th ed.)Lefrancois, Guy R. Psychology. Wadsworth, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.