Al Mogel، A. A. I.، و Stewart، B. R. (1984). FACTORS ASSOCIATED WITH THE ADOPTION OF RECOMMENDED FARM PRACTICES AMONG WHEAT GROWING FARMERS IN AL-HASA, SAUDI ARABIA (رسالة دكتوراه غير منشورة). University of Missouri، كولومبيا. مسترجع من http://search.mandumah.com/Record/615966
Al Mogel، Abd Alrahman Ibrahim، و Bob R. Stewart. "FACTORS ASSOCIATED WITH THE ADOPTION OF RECOMMENDED FARM PRACTICES AMONG WHEAT GROWING FARMERS IN AL-HASA, SAUDI ARABIA" رسالة دكتوراه. University of Missouri، كولومبيا، 1984. مسترجع من http://search.mandumah.com/Record/615966