Hoppen, H. J. (1969). Farm implements for arid and tropical regions. Food and Agriculture Organization ofunited states.
استشهاد بنمط شيكاغوHoppen, H J. Farm Implements for Arid and Tropical Regions. Rome: Food and Agriculture Organization ofunited states, 1969.
MLA استشهادHoppen, H J. Farm Implements for Arid and Tropical Regions. Food and Agriculture Organization ofunited states, 1969.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.