APA (7th ed.) Citation

Thayer, W. R. (1916). The life and letters of John Hay. Houghton Mifflin.

Chicago Style (17th ed.) Citation

Thayer, William Roscoe. The Life and Letters of John Hay. Boston: Houghton Mifflin, 1916.

MLA (9th ed.) Citation

Thayer, William Roscoe. The Life and Letters of John Hay. Houghton Mifflin, 1916.