APA (7th ed.) Citation

Nicolay, J. G., & Hay, J. (1890). Abraham Lincoln: A history. The Century co.

Chicago Style (17th ed.) Citation

Nicolay, John George, and John Hay. Abraham Lincoln: A History. New York: The Century co, 1890.

MLA (9th ed.) Citation

Nicolay, John George, and John Hay. Abraham Lincoln: A History. The Century co, 1890.