See G. E. Mowry, The California Progressives (1951, repr. 1963); A. S. Link, Woodrow Wilson and the Progressive Era (1954, repr. 1963); S. P. Hays, The Response to Industrialism (1957); R. B. Nye, Midwestern Progressive Politics, 1870–1958 (1959, repr. 1965); R. Hofstadter, The Age of Reform (1955, repr. 1963) and The Progressive Movement, 1900–1915 (1963, repr. 1986); G. Kolko, The Triumph of Conservatism (1963, repr. 1967); D. A. Shannon, ed., Progressivism and Postwar Disillusionment, 1898–1928 (1966); A. Davis, Spearheads for Reform (1967); R. H. Wiebee, The Search for Order (1967); D. Kennedy, ed., Progressivism (1971); B. M. Stave, ed., Urban Bosses, Machines, and Progressive Reformers (1971); J. D. Bunker, Urban Liberals and Progressive Reform (1973); M. McGerr, A Fierce Discontent: Rise and Fall of the Progressive Movement in America, 1870–1920 (2003).
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