Burt, J. (2013). Lincoln's tragic pragmatism: Lincoln, Douglas, and moral conflict. Belknap Press of Harvard University Press.
Lua i Stíl Chicago (17ú heag.)Burt, John. Lincoln's Tragic Pragmatism: Lincoln, Douglas, and Moral Conflict. Cambridge, Mass.: Belknap Press of Harvard University Press, 2013.
Lua MLA (9ú heag.)Burt, John. Lincoln's Tragic Pragmatism: Lincoln, Douglas, and Moral Conflict. Belknap Press of Harvard University Press, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.