Jan, M. S. A., & Snoddy, J. E. (1989). An investigation of the problems of the English program in the intermediate boys schools of Saudi Arabia. Michigan State University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Jan, Mohammed Saleh Ali, و James E. Snoddy. An Investigation of the Problems of the English Program in the Intermediate Boys Schools of Saudi Arabia. Michigan: Michigan State University, 1989.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Jan, Mohammed Saleh Ali, و James E. Snoddy. An Investigation of the Problems of the English Program in the Intermediate Boys Schools of Saudi Arabia. Michigan State University, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.