Young Men's Christian Associations of North America. International Committee, Clark, W., Tipper, H., Roe, J. W., & Polakov, W. N. (1921). Foremanship: The standard course of the United Y. M. C. A. Schools. Association Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Young Men's Christian Associations of North America. International Committee, Wallace Clark, Harry Tipper, Joseph Wickham Roe, و Walter Nicholas Polakov. Foremanship: The Standard Course of the United Y. M. C. A. Schools. [New York: Association Press, 1921.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Young Men's Christian Associations of North America. International Committee, et al. Foremanship: The Standard Course of the United Y. M. C. A. Schools. Association Press, 1921.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.