Gaya APA
Campbell, D, T., Stanley, J, C. (1966).
Experimental and quasi-ekperimental designs for research .
Chicago:
Rand Meally & Comany.
Gaya MLA
Campbell, Donal, T., Stanley, Julian, C.
"Experimental and quasi-ekperimental designs for research".
Chicago:
Rand Meally & Comany,
1966.
Text.