Gaya APA

HUGHES, H, D., Metcalfe, D, S. (1972). CROP PRODUCTION THIRD EDITION (Third Edition). New York: Macmillan , Inc.

Gaya MLA

HUGHES, Harold, D.., Metcalfe, Darrel, S.. "CROP PRODUCTION THIRD EDITION". Third Edition New York: Macmillan , Inc, 1972. Textbook.