Pritchard, M. H., & Emerson, J. (2011). The dark days of Abraham Lincoln's widow, as revealed by her own letters. Southern Illinois University Press.
芝加哥风格引文Pritchard, Myra Helmer, 与 Jason Emerson. The Dark Days of Abraham Lincoln's Widow, as Revealed by Her Own Letters. Carbondale: Southern Illinois University Press, 2011.
MLA引文Pritchard, Myra Helmer, 与 Jason Emerson. The Dark Days of Abraham Lincoln's Widow, as Revealed by Her Own Letters. Southern Illinois University Press, 2011.
警告：这些引文格式不一定是100％准确.