Ludwig, E., Paul, E., & Paul, C. (1930). Lincoln. Lincoln History Society.
Lua i Stíl Chicago (17ú heag.)Ludwig, Emil, Eden Paul, agus Cedar Paul. Lincoln. New York: Lincoln History Society, 1930.
Lua MLA (9ú heag.)Ludwig, Emil, et al. Lincoln. Lincoln History Society, 1930.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.