APA (7th ed.) Citation

McKinley, W. (1963). Index to the William McKinley papers. Library of Congress.

Chicago Style (17th ed.) Citation

McKinley, William. Index to the William McKinley Papers. Washington: Library of Congress, 1963.

MLA (9th ed.) Citation

McKinley, William. Index to the William McKinley Papers. Library of Congress, 1963.

Warning: These citations may not always be 100% accurate.