Gaya APA

Morren, G, E., Wilson, K, K. (1990). System approaches for improvement in agriculture and resource management / Kathleen K. Wilson, George E.B. Morren, Jr. . New York: Macmillan.

Gaya MLA

Morren, George, E.B.., Wilson, Kathleen, Karah. "System approaches for improvement in agriculture and resource management / Kathleen K. Wilson, George E.B. Morren, Jr.". New York: Macmillan, 1990. Textbook.