Baqadir، A. A. A. M.، و Logan، D. W. (2002). A Business Plan of Zam Zam that is Based on the Research on Desert Cooler Market and Zam - Zam's Current Situation (رسالة ماجستير غير منشورة). University of Glasgow، غلاسكو. مسترجع من http://search.mandumah.com/Record/600159
Baqadir، Abd Allah A. M.، و David W. Logan. "A Business Plan of Zam Zam That Is Based On the Research On Desert Cooler Market and Zam - Zam's Current Situation" رسالة ماجستير. University of Glasgow، غلاسكو، 2002. مسترجع من http://search.mandumah.com/Record/600159