Gaya APA

Fred, K, ,. (1990). Asas-Asas Penelitian Behavioral (Cet. 3). Yogyakarta: Gadjah Mada University Press.

Gaya MLA

Fred, KERLINGER, ,. "Asas-Asas Penelitian Behavioral". Cet. 3 Yogyakarta: Gadjah Mada University Press, 1990. Text.