Morris, B. E. (2006). The effects of the draft on United States presidential approval ratings during Vietnam war, 1954-1975. The University of Alabama.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Morris, Brett E. The Effects of the Draft on United States Presidential Approval Ratings During Vietnam War, 1954-1975. Alabama: The University of Alabama, 2006.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Morris, Brett E. The Effects of the Draft on United States Presidential Approval Ratings During Vietnam War, 1954-1975. The University of Alabama, 2006.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.