Hassler, W. W. (2010). The first day at Gettysburg: Crisis at the crossroads. University of Alabama Press.
Lua i Stíl Chicago (17ú heag.)Hassler, Warren W. The First Day at Gettysburg: Crisis at the Crossroads. Tuscaloosa, Ala.: University of Alabama Press, 2010.
Lua MLA (9ú heag.)Hassler, Warren W. The First Day at Gettysburg: Crisis at the Crossroads. University of Alabama Press, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.