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دليل المستخدم
Ali، A. M.، و Saupe، W. E. (1976). THE RELATIONSHIP OF EDUCATION AND OTHER VARIABLES TO NET FARM INCOME, NON-LAND FARM INVESTMENT AND DESIRE TO CONTINUE FARMING OF SMALL FARMERS IN WISCONSIN AND NORTH CAROLINA (رسالة دكتوراه غير منشورة). University of Wisconsin–Madison، ماديسون. مسترجع من http://search.mandumah.com/Record/615087
Ali، Abdien Mohammed، و William E. Saupe. "THE RELATIONSHIP OF EDUCATION AND OTHER VARIABLES TO NET FARM INCOME, NON-LAND FARM INVESTMENT AND DESIRE TO CONTINUE FARMING OF SMALL FARMERS IN WISCONSIN AND NORTH CAROLINA" رسالة دكتوراه. University of Wisconsin–Madison، ماديسون، 1976. مسترجع من http://search.mandumah.com/Record/615087