Gaya APA

Metcalfe, D, S., Elkins, D, M. (1980). Crop Production : Principles and Practice (Edisi 4). United States of America: Macmillan Publishing Company.

Gaya MLA

Metcalfe, Darrel, S., Elkins, Donald, M. "Crop Production : Principles and Practice". Edisi 4 United States of America: Macmillan Publishing Company, 1980. Text.