Dirck, B. R. (2012). Lincoln and the Constitution. Southern Illinois University Press.
Lua i Stíl Chicago (17ú heag.)Dirck, Brian R. Lincoln and the Constitution. Carbondale: Southern Illinois University Press, 2012.
Lua MLA (9ú heag.)Dirck, Brian R. Lincoln and the Constitution. Southern Illinois University Press, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.