APA (7th ed.) Citation

Hopfen, H. J., & Biesalski, E. (1953). Small farm implements. Food and Agriculture Organization of the United Nations.

Chicago Style (17th ed.) Citation

Hopfen, Hans Joachim, and Ernst Biesalski. Small Farm Implements. Rome: Food and Agriculture Organization of the United Nations, 1953.

MLA (9th ed.) Citation

Hopfen, Hans Joachim, and Ernst Biesalski. Small Farm Implements. Food and Agriculture Organization of the United Nations, 1953.