Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (8th ed.)

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