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دليل المستخدم
Al Othman، A. A. A. S.، و Wakefield، S. (2002). Environmental Study of Wadi Hanifah, Riyadh with Special Reference to Wastewater Disposal and the Quality of the Stream Water, Groundwater and Sediments (رسالة دكتوراه غير منشورة). Cranfield University، لندن. مسترجع من http://search.mandumah.com/Record/611465
Al Othman، Ahmed Abd Alrahman S.، و Simon Wakefield. "Environmental Study of Wadi Hanifah, Riyadh With Special Reference to Wastewater Disposal and the Quality of the Stream Water, Groundwater and Sediments" رسالة دكتوراه. Cranfield University، لندن، 2002. مسترجع من http://search.mandumah.com/Record/611465