Shaer، A. A. I.، و Cox، R. A. (1983). A Needs Assessment Survey for the Development of A Plan for Modification and Expansion of the Natural History Museum of Saudi Arabia (رسالة دكتوراه غير منشورة). University of Pittsburgh، بيتسبرغ. مسترجع من http://search.mandumah.com/Record/611049
Shaer، Abd Alrahman I.، و Robert A. Cox. "A Needs Assessment Survey for the Development of A Plan for Modification and Expansion of the Natural History Museum of Saudi Arabia" رسالة دكتوراه. University of Pittsburgh، بيتسبرغ، 1983. مسترجع من http://search.mandumah.com/Record/611049