Slavery is a dark spot on the face of the nation

Chicago citation style
Slavery is a dark spot on the face of the nation. 1843. Retrieved from the Digital Public Library of America, http://digitalcollections.nypl.org/items/510d47dd-e861-a3d9-e040-e00a18064a99. (Accessed May 27, 2018.)
APA citation style
(1843) Slavery is a dark spot on the face of the nation. Retrieved from the Digital Public Library of America, http://digitalcollections.nypl.org/items/510d47dd-e861-a3d9-e040-e00a18064a99
MLA citation style
Retrieved from the Digital Public Library of America <http://digitalcollections.nypl.org/items/510d47dd-e861-a3d9-e040-e00a18064a99>.
Note: These citations are programmatically generated and may be incomplete.