Henry J. Heck, American Speech, Vol. 3, No. 3 (Feb., 1928), pp. 186-190, Duke University Press, DOI: 10.2307/452330, https://www.jstor.org/stable/452330
The Second Annual Report of the Arizona Corporations Commission for the period of December 1st 1913 to June 30th 1914, Arizona State Press, by authority of Chapter XXVIII Title I, Revised Statutes of Arizona 1913, Civil Code, 1914, p. 28, https://play.google.com/store/books/details?id=6PhCAQAAMAAJ, accessed 8/23/2018
