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*[https://www.shapell.org/historical-perspectives/between-the-lines/robert-todd-lincoln-witness-presidential-assassinations/ Robert Todd Lincoln, Witness to Presidential Assassinations]
*[https://www.biography.com/political-figure/robert-todd-lincoln biography-Robert Todd Lincoln]
*[https://www.nps.gov/articles/000/robert-todd-lincoln-and-presidential-assassiations-not-formal-title.htm National Historical Park-Robert Todd Lincoln and Presidential Assassiations]*[https://www.historynet.com/robert-todd-lincoln historynet-Robert Todd Lincoln] *[ 網址 網站名稱https://www.newenglandhistoricalsociety.com/the-mtl-insanity-file-of-robert-todd-lincoln-discovered/ newenglandhistoricalsociety-The MTL Insanity File of Robert Todd Lincoln Discovered ]