U.S Department, O. A. (1974). 1974 Yearbook of Agriculture. U.S Govt ptinting office.
استشهاد بنمط شيكاغوU.S Department, Of Agriculture. 1974 Yearbook of Agriculture. Washington: U.S Govt ptinting office, 1974.
MLA استشهادU.S Department, Of Agriculture. 1974 Yearbook of Agriculture. U.S Govt ptinting office, 1974.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.