Gaya APA

Keraf, S, A. (1990). Asas-asas penelitian behavioral (ed. 3). Yogyakarta: Gadjah Mada University Press.

Gaya MLA

Keraf, Sonny, A.. "Asas-asas penelitian behavioral". ed. 3 Yogyakarta: Gadjah Mada University Press, 1990. .