APA (7th ed.) Citation

Ruthenberg, H. (1976). Farming systems in the tropics (2. ed.). Clarendon Pr.

Chicago Style (17th ed.) Citation

Ruthenberg, Hans. Farming Systems in the Tropics. 2. ed. Oxford: Clarendon Pr, 1976.

MLA (9th ed.) Citation

Ruthenberg, Hans. Farming Systems in the Tropics. 2. ed. Clarendon Pr, 1976.