(1999). 1997 census of agriculture. [Washington, D.C.]: U.S. Dept. of Agriculture, National Agricultural Statistics Services.
استشهاد بنمط شيكاغو1997 Census of Agriculture. [Washington, D.C.]: U.S. Dept. of Agriculture, National Agricultural Statistics Services, 1999.
MLA استشهاد1997 Census of Agriculture. [Washington, D.C.]: U.S. Dept. of Agriculture, National Agricultural Statistics Services, 1999.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.