Cozby, P. C. (1989). Methods in behavioral research (4th ed.). Mayfield.
Cita Chicago (17th ed.)Cozby, Paul C. Methods in Behavioral Research. 4th ed. California: Mayfield, 1989.
Cita MLA (9th ed.)Cozby, Paul C. Methods in Behavioral Research. 4th ed. Mayfield, 1989.
Atenció: Aquestes cites poden no estar 100% correctes.