C. R. Fish, "Civil Service and the Patronage" (1905). The best work on the subject.
J. D. Barnett, "The Operation of the Initiative, Referendum, and Recall in Oregon" (1915). A helpful, intensive study of these important questions.
E. P. Oberholtzer, The Referendum in America (1912). The most satisfactory and comprehensive work on the subject. Also discusses the initiative.
J. R. Commons, "Proportional Representation" (1907). The standard American book on the subject.
R. C. Brooks, "Corruption in American Politics and Life" (1910). A survey of our political pathology.