Cozby, P. C. (1985). Methods in behavioral research (3rd.ed.). Mayfield.
Dyfyniad Arddull ChicagoCozby, Paul C. Methods in Behavioral Research. 3rd.ed. Palo Alto: Mayfield, 1985.
Dyfyniad MLACozby, Paul C. Methods in Behavioral Research. 3rd.ed. Mayfield, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.