Sharaf, A. S., & O'Neill, W. F. (1991). Distance education: An alternative route to formal college education in Saudi Arabia \. University of Southern California.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sharaf, Ahmad Saleh, و William F. O'Neill. Distance Education: An Alternative Route to Formal College Education in Saudi Arabia \. California: University of Southern California, 1991.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sharaf, Ahmad Saleh, و William F. O'Neill. Distance Education: An Alternative Route to Formal College Education in Saudi Arabia \. University of Southern California, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.