KRUPKA, Jaroslav. Před 160 lety vypukla americká občanská válka. Bojovali v ní také čeští rodáci. Deník.cz [online]. 2021-04-14 [cit. 2021-07-04]. Dostupné online.
SPRINGFIELD, Mailing Address: 413 S. 8th Street; US, IL 62701 Phone: 217 492-4241 Contact. Slavery as a Cause of the Civil War - Lincoln Home National Historic Site (U.S. National Park Service). www.nps.gov [online]. [cit. 2023-05-07]. Dostupné online. (anglicky)
rozhlas.cz
plus.rozhlas.cz
MACHONIN, Jan. Válka Severu proti Jihu proměnila americké Vánoce a zrodila Santu Clause [online]. Český rozhlas, 2018-12-24, rev. 2018-12-24 [cit. 2021-07-04]. Dostupné online.
si.edu
click.si.edu
"Recognized as a searing indictment of slavery, Gordon’s portrait was presented as the latest evidence in the abolitionist campaign. ... Abolitionist leaders such as William Lloyd Garrison referred to it repeatedly in their work." See Frank H. Goodyear, III, "Photography changes the way we record and respond to social issues," Smithsonian Photography Initiative.