Wisconsin Alumni Magazine, Volume 9, 1907, pp. 58, 229.
Horace Secrist, "An Economic Analysis of the Constitutional Restrictions upon Public Indebtedness in the United States", PhD dissertation, University of Wisconsin, 1911, Bulletin of the University of Wisconsin 637, Economics and Political Science Series 6.1, April 1914, pp. 1–132, electronic reproduction Getzville, New York: Hein, OCLC982085927.
Stephen M. Stigler, Statistics on the Table: The History of Statistical Concepts and Methods, 1999, repr. Cambridge, Massachusetts: Harvard University, 2002, ISBN9780674009790, pp. 162–70.
Stigler, "Regression Towards the Mean, Historically Considered", Statistical Methods in Medical Research 6 (1997) 103–14, repr. SAGE Directions in Educational Psychology Volumes 1–5, ed. Neil J Salkind, London: SAGE, ISBN978-0-85702-178-6, Volume 5, pp. 147–48.
Alex Reinhart, Statistics Done Wrong: The Woefully Complete Guide, San Francisco: No Starch-O'Reilly, 2015, ISBN9781593276201, p. 68.
Stigler, The Seven Pillars of Statistical Wisdom, Cambridge,. Massachusetts: Harvard University, 2016, ISBN9780674088917, pp. 139–40.
Horace Secrist, "An Economic Analysis of the Constitutional Restrictions upon Public Indebtedness in the United States", PhD dissertation, University of Wisconsin, 1911, Bulletin of the University of Wisconsin 637, Economics and Political Science Series 6.1, April 1914, pp. 1–132, electronic reproduction Getzville, New York: Hein, OCLC982085927.