APA (7e ed.) Bronvermelding

Hughes, H. D. M., & Metcalfe, D. S. (1972). Crop production (3d ed.). Macmillan.

Chicago (17e ed.) Bronvermelding

Hughes, Harold De Mott, en Darrel S. Metcalfe. Crop Production. 3d ed. New York: Macmillan, 1972.

MLA (8e ed.) Bronvermelding

Hughes, Harold De Mott, en Darrel S. Metcalfe. Crop Production. 3d ed. Macmillan, 1972.