APA (7th ed.) Citation

Schurz, C., & Coolidge, C. (1920). Abraham Lincoln: An essay. Houghton Mifflin Company.

Chicago Style (17th ed.) Citation

Schurz, Carl, and Calvin Coolidge. Abraham Lincoln: An Essay. Boston ; New York: Houghton Mifflin Company, 1920.

MLA (8th ed.) Citation

Schurz, Carl, and Calvin Coolidge. Abraham Lincoln: An Essay. Houghton Mifflin Company, 1920.