Hassler, W. W. (2010). The first day at Gettysburg: Crisis at the crossroads. University of Alabama Press.
Chicago-referens (17:e uppl.)Hassler, Warren W. The First Day at Gettysburg: Crisis at the Crossroads. Tuscaloosa, Ala.: University of Alabama Press, 2010.
MLA-referens (9:e uppl.)Hassler, Warren W. The First Day at Gettysburg: Crisis at the Crossroads. University of Alabama Press, 2010.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.