APA (7th ed.) Citation

Lincoln, A., Tracy, G. A., Allen, F. H., & Tarbell, I. M. (1917). Uncollected letters of Abraham Lincoln. Houghton Mifflin Company.

Chicago Style (17th ed.) Citation

Lincoln, Abraham, Gilbert A. Tracy, Francis H. Allen, and Ida M. Tarbell. Uncollected Letters of Abraham Lincoln. Boston: Houghton Mifflin Company, 1917.

MLA (8th ed.) Citation

Lincoln, Abraham, et al. Uncollected Letters of Abraham Lincoln. Houghton Mifflin Company, 1917.