APA (7th ed.) Citation

Duckham, A. N., & Masefield, G. B. (1970). Farming systems of the world. Praeger Publishers.

Chicago Style (17th ed.) Citation

Duckham, A. N., and G. B. Masefield. Farming Systems of the World. New York: Praeger Publishers, 1970.

MLA (9th ed.) Citation

Duckham, A. N., and G. B. Masefield. Farming Systems of the World. Praeger Publishers, 1970.