* {{Link-en|亞伯拉罕·林肯的專利|Abraham Lincoln's patent}}

* {{Link-en|林肯的世系图|Lincoln family tree}}

== 延伸閱讀 ==

|description=In His Father's Shadow: Robert Todd Lincoln }}

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==外部連結==

*[https://www.historynet.com/robert-todd-lincoln historynet-Robert Todd Lincoln]

*[https://www.newenglandhistoricalsociety.com/the-mtl-insanity-file-of-robert-todd-lincoln-discovered/ newenglandhistoricalsociety-The MTL Insanity File of Robert Todd Lincoln Discovered ]