Al Howaimil، A. A. S.، و Keller، A. Z. (1996). Safety Related to Radiotherapy Equipment: Risk Analysis of Radiological Hospital Equipment and Procedure Including Maintence Used for Patient Treatment (رسالة دكتوراه غير منشورة). University of Bradford، برادفورد. مسترجع من http://search.mandumah.com/Record/600424
Al Howaimil، Abd Allah S.، و A. Z. Keller. "Safety Related to Radiotherapy Equipment: Risk Analysis of Radiological Hospital Equipment and Procedure Including Maintence Used for Patient Treatment" رسالة دكتوراه. University of Bradford، برادفورد، 1996. مسترجع من http://search.mandumah.com/Record/600424