Library of Congress. Classification Division, Churchill, G. M., Perley, C. W., & Bay, J. C. (1915). Classification: Completing class G : Geography, anthropology, sports, and games. Government Printing Office.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Library of Congress. Classification Division, G. M. Churchill, Clarence W. Perley, و J. Christian Bay. Classification: Completing Class G : Geography, Anthropology, Sports, and Games. Washington: Government Printing Office, 1915.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Library of Congress. Classification Division, et al. Classification: Completing Class G : Geography, Anthropology, Sports, and Games. Government Printing Office, 1915.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.