APA (7th ed.) Citation

Webster, C. C., & Wilson, P. N. (1969). Agriculture in the tropics. Longmans.

Chicago Style (17th ed.) Citation

Webster, Cyril C., and Peter N. Wilson. Agriculture in the Tropics. London: Longmans, 1969.

MLA (9th ed.) Citation

Webster, Cyril C., and Peter N. Wilson. Agriculture in the Tropics. Longmans, 1969.