Cozby, P. C. (2006). Methods in behavioral research. Boston: McGraw-Hill.
Dyfyniad Arddull ChicagoCozby, Paul C. Methods in Behavioral Research. Boston: McGraw-Hill, 2006.
Dyfyniad MLACozby, Paul C. Methods in Behavioral Research. Boston: McGraw-Hill, 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.