"Advocates of Empire: William Mckinley, The Senate and American Expansion, 1898-1899" (University of Delaware; Proquest Dissertations Publishing, 1978. 7816908).
Labinski, Nicholas Winter. "A Transitional Moment: William McKinley's Foreign Policy Rhetoric and America's Outward Turn" (University of Kansas; ProQuest Dissertations Publishing,  2017. 10687965).
Matlosz, Gregory. "The Political Symbiosis of Rutherford B. Hayes & William McKinley" (Drew University; ProQuest Dissertations Publishing,  2015. 3700842).
Ofek, Hillel. "A Just Peace: Grover Cleveland, William McKinley, and the Moral Basis of American Foreign Policy" (University of Texas at Austin; ProQuest Dissertations Publishing,  2018. 28166006).
Waksmundski, John. "Mckinley Politics and the Changing Attitudes Toward American Labor, 1870-1900" (The Ohio State University; Proquest Dissertations Publishing, 1972. 7311599).
External links
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William McKinley  at Wikipedia's sister projects

Media from CommonsQuotations from WikiquoteTexts from Wikisource

Official
William McKinley Presidential Library and Museum
White House biography
Speeches
Text of a number of McKinley speeches, Miller Center of Public Affairs
Media coverage
William McKinley collected news and commentary at The New York Times
Other
United States Congress. "William McKinley (id: M000522)". Biographical Directory of the United States Congress.
