Buenker, John D., John C. Burnham, and Robert M. Crunden. Progressivism (1986) short overview
Buenker, John D. and Joseph Buenker, Eds. Encyclopedia of the Gilded Age and Progressive Era. Sharpe Reference, 2005. xxxii + 1256 pp. in three volumes. ISBN 0-7656-8051-3. 900 articles by 200 scholars
Buenker, John D. ed. Dictionary of the Progressive Era (1980), short articles by scholars
Jensen, Richard. "Democracy, Republicanism and Efficiency: The Values of American Politics, 1885-1930," in Byron Shafer and Anthony Badger, eds, Contesting Democracy: Substance and Structure in American Political History, 1775-2000 (U of Kansas Press, 2001) pp 149-180; online version
Kennedy, David M. ed., Progressivism: The Critical Issues (1971), readings
Kloppenberg, James T. Uncertain victory: social democracy and progressivism in European and American thought, 1870-1920 1986 online at ACLS e-books
Leuchtenburg, William E. "Progressivism and Imperialism: The Progressive Movement and American Foreign Policy, 1898-1916," The Mississippi Valley Historical Review, Vol. 39, No. 3. (Dec., 1952), pp. 483-504. JSTOR
Link, Arthur S. Woodrow Wilson and the Progressive Era: 1913-1917 (1954), standard scholarly survey
Link, Arthur S. Wilson: The Road to the White House (1947), first volume of standard biography (to 1917); Wilson: The New Freedom (1956); Wilson: The Struggle for Neutrality: 1914-1915 (1960); Wilson: Confusions and Crises: 1915-1916 (1964); Wilson: Campaigns for Progressivism and Peace: 1916-1917 (1965), the last volume of standard biography. all 5 volumes are online free (if you have a account) at ACLS e-books
Mann, Arthur. ed., The Progressive Era (1975), readings from scholars
Lasch, Christopher. The True and Only Heaven: Progress and its Critics (1991) excerpt and text search
McGerr, Michael. A Fierce Discontent: The Rise and Fall of the Progressive Movement in America, 1870-1920 (2003)
Harbaugh, William Henry. The Life and Times of Theodore Roosevelt. (1963); also titled "Power and Responsibility; very good political biography excerpt and text search
Harrison, Robert. Congress, Progressive Reform, and the New American State (2004) excerpt and text search
Hofstadter, Richard. The American Political Tradition (1948), ch. 8-9-10 on Bryan, Roosevelt and Wilson. [ excerpt and text search]
Link, Arthur Stanley. Woodrow Wilson and the Progressive Era, 1910-1917 (1972), standard history
Morris, Edmund Theodore Rex. (2001), very well written biography of Theodore Roosevelt covers 1901-1909 excerpt and text search
Mowry, George E. Theodore Roosevelt and the Progressive Movement. (2001) standard history of 1912 movement
Sanders, Elizabeth. Roots of Reform: Farmers, Workers and the American State, 1877-1917 (1999) excerpt and text search
Wilson, Joan Hoff. Herbert Hoover, Forgotten Progressive (1965)
Glad, Paul W. "Progressives and the Business Culture of the 1920s," The Journal of American History, Vol. 53, No. 1. (Jun., 1966), pp. 75-89. in JSTOR
Kolko, Gabriel. "The Triumph of Conservatism" (1963), Progressive reforms helped business
Kyle, Bruce and Chris Nyland; "Scientific Management, Institutionalism, and Business Stabilization: 1903-1923" Journal of Economic Issues, Vol. 35, 2001
Mink, Gwendolyn. Old Labor and New Immigrants in American Political Development: Union, Party, and State, 1875–1920 (1986);
Montgomery, David. "Workers' Movements in the United States Confront Imperialism: The Progressive Era Experience." Journal of Gilded Age and Progressive era 7.1 (May 2008) online
Nelson, Daniel. Managers and Workers: Origins of the New Factory System in the United States, 1880–1920 (1975),
Sanders, Elizabeth. Roots of Reform: Farmers, Workers and the American State, 1877-1917 (1999)
Stromquist, Shelton. Reinventing 'The People': The Progressive Movement, the Class Problem, and the Origins of Modern Liberalism, (2006). ISBN 0-252-07269-3.
Wiebe, Robert H. Businessmen and Reform: A Study of the Progressive Movement (1968)
Wiebe, Robert H. "Business Disunity and the Progressive Movement, 1901-1914," The Mississippi Valley Historical Review, Vol. 44, No. 4. (Mar., 1958), pp. 664-685. in JSTOR
Abell, Aaron I. American Catholicism and Social Action: A Search for Social Justice, 1865-1950 (1960),
Buenker, John D. Urban Liberalism and Progressive Reform (1973).
Buenker, John D. The Progressive Era, 1893-1914 (1998), in Wisconsin
Feffer, Andrew. The Chicago Pragmatists and American Progressivism (1993).
Frankel, Noralee and Nancy S. Dye, eds. Gender, Class, Race, and Reform in the Progressive Era (1991). excerpt and text search
Hahn, Steven. A Nation under Our Feet: Black Political Struggles in the Rural South from Slavery to the Great Migration (2003).
Harlan, Louis R. Booker T. Washington (2 vol 1973, 1986); Pulitzer prize excerpt and text search
Huthmacher, J. Joseph "Urban Liberalism and the Age of Reform" Mississippi Valley Historical Review 49 (1962): 231-241, in JSTOR; emphasized urban, ethnic, working class support for reform
Lewis, David L. W.E.B. Du Bois: Biography of a Race: 1868-1919 (1993), 2 vol; Pulitzer Prize
Link, William A. The Paradox of Southern Progressivism, 1880-1930 (1997).
Lubove, Roy. The Progressives and the Slums: Tenement House Reform in New York City, 1890-1917 Greenwood Press: 1974.
Rodgers, Daniel T. Atlantic Crossings: Social Politics in a Progressive Age (2000). influential study that stresses links with Europe online in ACLS e-books
Starr, Kevin. Inventing the Dream: California through the Progressive Era (1986) excerpt and text search
Thelen, David. The New Citizenship, Origins of Progressivism in Wisconsin, 1885-1900 (1972).
Wesser, Robert F. Charles Evans Hughes: politics and reform in New York, 1905-1910 (1967).
Beale Howard K. Theodore Roosevelt and the Rise of America to World Power. (1956).
Gillette, Jr., Howard. "The Military Occupation of Cuba, 1899–1902: Workshop for American Progressivism," American Quarterly 25 (Oct. 1973): 410–25.
Montgomery, David. "Workers' Movements in the United States Confront Imperialism: The Progressive Era Experience." Journal of Gilded Age and Progressive era 7.1 (May 2008) online
Burt, Elizabeth V., ed. The Progressive Era: Primary Documents on Events from 1890 to 1914 (Debating Historical Issues in the Media of the Time) (2004) excerpt and text search
Croly, Herbert David. The Promise of American Life (1909), highly influential manifesto full text online
Croly, Herbert David. Progressive Democracy (1914), theory full text online
Cronon, William and David Stradling, eds. Conservation in the Progressive Era: Classic Texts (2004) excerpt and text search
De Witt, Benjamin P. The Progressive Movement (1915), a comprehensive contemporary history of the era full text online
Pease, Otis, ed. The Progressive Years: The Spirit and Achievement of American Reform (1962), primary documents