Pritchard, M. H., & Emerson, J. (2011). The dark days of Abraham Lincoln's widow, as revealed by her own letters. Southern Illinois University Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Pritchard, Myra Helmer, و Jason Emerson. The Dark Days of Abraham Lincoln's Widow, as Revealed by Her Own Letters. Carbondale: Southern Illinois University Press, 2011.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Pritchard, Myra Helmer, و Jason Emerson. The Dark Days of Abraham Lincoln's Widow, as Revealed by Her Own Letters. Southern Illinois University Press, 2011.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.