Mustafa, A. H., & Warfield, C. (1985). A study of the academic problems encountered by Saudi students at Western Michigan University. Western Michigan University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Mustafa, Ali Hajjan, و Charles Warfield. A Study of the Academic Problems Encountered by Saudi Students at Western Michigan University. Michigan: Western Michigan University, 1985.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Mustafa, Ali Hajjan, و Charles Warfield. A Study of the Academic Problems Encountered by Saudi Students at Western Michigan University. Western Michigan University, 1985.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.