APA (7th ed.) Citation

Hopfen, H. J. (1969). Farm implements for arid and tropical regions (Rev. ed.). Food and Agriculture Organization of the United Nations.

Chicago Style (17th ed.) Citation

Hopfen, Hans Joachim. Farm Implements for Arid and Tropical Regions. Rev. ed. Rome: Food and Agriculture Organization of the United Nations, 1969.

MLA (9th ed.) Citation

Hopfen, Hans Joachim. Farm Implements for Arid and Tropical Regions. Rev. ed. Food and Agriculture Organization of the United Nations, 1969.