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^ Sotos, John G. (2008). The Physical Lincoln Sourcebook. Mt. Vernon Book Systems. ISBN 978-0-9818193-3-4.

^ Mayell, Hillary (July 17, 2001). "Did Mercury in 'Little Blue Pills' Make Abraham Lincoln Erratic?". National Geographic News. Retrieved October 12, 2009.

^ Jump up to: a b Verghese, Abraham (May 20, 2009). "Was Lincoln Dying Before He Was Shot?". The Atlantic. Palo Alto, California. Archived from the original on April 13, 2014. Retrieved October 8, 2014.

^ Thomas 2008, p. 61.

^ Jaffa 2000, p. 399; Thomas 2008, p. 61.

^ Diggins 1986, p. 307; Thomas 2008, p. 61.

^ Foner 2010, p. 215; Thomas 2008, p. 61.

^ Jaffa 2000, p. 263; Thomas 2008, p. 61.

^ Burton, Orville Vernon (2008). The Age of Lincoln: A History. Farrar, Straus and Giroux. ISBN 978-1-4299-3955-3.

^ Boritt & Pinsker 2002, pp. 196–198, 229–231, 301.

^ Current 1999.

^ Jump up to: a b Wilentz 2012.

^ Harris 2007, p. 2.

^ Randall 1962, p. 175.

^ Belz 1998, p. 86.

^ Burt, Andrew (May 13, 2013). "'These United States': How Obama's Vocal Tic Reveals a Polarized America". The Atlantic. Retrieved February 14, 2020.

^ Douglass 2008, pp. 259–260.

