^See “Sons of the Wild Jackass,” Cedric B. Cowing, Populists, Plungers and Progressives: A Social History of Stock and Commodity Speculation 1890-1936 (Princeton University Press, 1965) pp. 127-154. “Right up to the 1929 precipice Senate progressives from the Midwest warned the public of the dangerous situation.” (p. 153)
^Cited in an editorial, "Iowa’s Courageous Reformer," Des Moines Register, April 18, 1969.
^Address of Dan W. Turner as Temporary Chairman of Republican State Convention, Des Moines, Iowa, July 10, 1912.