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دليل المستخدم
Refay، Y. A.، و Voigt، R. L. (1989). THE INFLUENCE OF VARIABLE AMOUNTS OF IRRIGATION WATER AND NITROGEN FERTILIZER AND THEIR INTERACTION ON THE DEVELOPMENT, GROWTH AND NITROGEN UPTAKE OF GRAIN SORGHUM (رسالة دكتوراه غير منشورة). University of Arizona، توسان. مسترجع من http://search.mandumah.com/Record/616730
Refay، Yahya Ali، و Robert L. Voigt. "THE INFLUENCE OF VARIABLE AMOUNTS OF IRRIGATION WATER AND NITROGEN FERTILIZER AND THEIR INTERACTION ON THE DEVELOPMENT, GROWTH AND NITROGEN UPTAKE OF GRAIN SORGHUM" رسالة دكتوراه. University of Arizona، توسان، 1989. مسترجع من http://search.mandumah.com/Record/616730