Al Omar، A. O.، و Cooper، R. G. (2002). Examination of Factors Which influence inter-individual and between gender, variability of quadriceps femoris voluntary and stimulated contractile performance in normal subjects (رسالة دكتوراه غير منشورة). University of Manchester، مانشستر. مسترجع من http://search.mandumah.com/Record/598523
Al Omar، Ahmed O.، و R. G. Cooper. "Examination of Factors Which Influence Inter-individual and between Gender, Variability of Quadriceps Femoris Voluntary and Stimulated Contractile Performance in Normal Subjects" رسالة دكتوراه. University of Manchester، مانشستر، 2002. مسترجع من http://search.mandumah.com/Record/598523