Al-Shahrani, A. A. S., & Howe, R. W. (1989). An analysis of variables related to biology achievement at the 12th grade level in the Southwestern region of Saudi Arabia. Ohio State University.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Al-Shahrani, Amer A. S., و Robert W. Howe. An Analysis of Variables Related to Biology Achievement at the 12th Grade Level in the Southwestern Region of Saudi Arabia. Ohio: Ohio State University, 1989.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Al-Shahrani, Amer A. S., و Robert W. Howe. An Analysis of Variables Related to Biology Achievement at the 12th Grade Level in the Southwestern Region of Saudi Arabia. Ohio State University, 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.