Gaya APA
Cozby, P, C.
(1985).
Methods in behavioral research
(
3th. ed.)
.
Palo alto:
Mayfield Publising company.
Gaya MLA
Cozby, Paul, C..
"Methods in behavioral research".
3th. ed.
Palo alto:
Mayfield Publising company,
1985.
Text.