Hassler, W. W. (2010). The first day at Gettysburg: Crisis at the crossroads. University of Alabama Press.
芝加哥风格引文Hassler, Warren W. The First Day at Gettysburg: Crisis at the Crossroads. Tuscaloosa, Ala.: University of Alabama Press, 2010.
MLA引文Hassler, Warren W. The First Day at Gettysburg: Crisis at the Crossroads. University of Alabama Press, 2010.
警告：这些引文格式不一定是100％准确.