Al Hadad، F.، و Ayres، J. (2009). A Comparative Study of Work-Related Stress Among Primary Health Care Physicians and Hospital Physicians in Riyadh Military Hospital, Saudi Arabia (رسالة ماجستير غير منشورة). University of Birmingham، برمنغهام. مسترجع من http://search.mandumah.com/Record/687439
Al Hadad، Faisal، و Jon Ayres. "A Comparative Study of Work-Related Stress Among Primary Health Care Physicians and Hospital Physicians in Riyadh Military Hospital, Saudi Arabia" رسالة ماجستير. University of Birmingham، برمنغهام، 2009. مسترجع من http://search.mandumah.com/Record/687439