APA (7th ed.) Citation

McKinley, W., & Richardson, J. D. (2004). A Supplement to A Compilation of the Messages and Papers of the Presidents. Project Gutenberg.

Chicago Style (17th ed.) Citation

McKinley, William, and James D. Richardson. A Supplement to A Compilation of the Messages and Papers of the Presidents. Project Gutenberg, 2004.

MLA (9th ed.) Citation

McKinley, William, and James D. Richardson. A Supplement to A Compilation of the Messages and Papers of the Presidents. Project Gutenberg, 2004.

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