APA استشهاد

Hoppen, H. J. (1969). Farm implements for arid and tropical regions. Food and Agriculture Organization ofunited states.

استشهاد بنمط شيكاغو

Hoppen, H J. Farm Implements for Arid and Tropical Regions. Rome: Food and Agriculture Organization ofunited states, 1969.

MLA استشهاد

Hoppen, H J. Farm Implements for Arid and Tropical Regions. Food and Agriculture Organization ofunited states, 1969.