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.
Lua i Stíl Chicago (17ú heag.)Young Men's Christian Associations of North America. International Committee, Wallace Clark, Harry Tipper, Joseph Wickham Roe, agus Walter Nicholas Polakov. Foremanship: The Standard Course of the United Y. M. C. A. Schools. [New York: Association Press, 1921.
Lua MLA (8ú heag.)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.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.