William Howard Taft, an Intimate History (1981)
Ballard, Rene N. "The Administrative Theory of William Howard Taft."Western Political Quarterly 7.1 (1954): 65–74 online.
Burns, Adam David. "Imperial vision: William Howard Taft and the Philippines, 1900–1921.". (PhD dissertation,   University of Edinburgh, 2010) online
Burton, David H. (2004). William Howard Taft, Confident Peacemaker. Philadelphia: Saint Joseph's University Press. ISBN 978-0-916101-51-0.
Burton, David H. Taft, Roosevelt, and the limits of friendship (2005) [1].
Butt,  Archibald W. Taft and Roosevelt: The Intimate Letters of Archie Butt, Military Aide (2 vols. 1930), valuable primary source. vol 1 online also vol 2 online
Coletta, Paolo E. "William Howard Taft."in The Presidents: A Reference History (1997)
Coletta, Paolo E.  "The Election of 1908" in Arthur M. Schlesinger, Jr. and Fred L Israel, eds., History of American Presidential Elections: 1789–1968 (1971) 3: 2049–2131.  online
Coletta, Paolo E. "The Diplomacy of Theodore Roosevelt and William Howard Taft," in Gerald K. Haines and J. Samuel Walker, eds., American Foreign Relations: A Historiographical Review (Greenwood, 1981)
Coletta, Paolo Enrico (1989). William Howard Taft: A Bibliography. Westport, CT: Meckler Corporation.
Coletta, Paolo Enrico (1973). The Presidency of William Howard Taft. Lawrence, KS: University Press of Kansas. ISBN 9780700600960.
