Map showing the distribution of the slave population of the southern states of the United States, compiled from the census of 1860 / drawn by E. Hergesheimer ; engr. by Th. Leonhardt.
MLA
Hergesheimer, E. (Edwin). Map showing the distribution of the slave population of the southern states of the United States, compiled from the census of 1860 / drawn by E. Hergesheimer ; engr. by Th. Leonhardt.. BRBL_00419. 1861. https://collections.library.yale.edu/catalog/15603983.
APA, 6th edition
Hergesheimer, E. (Edwin). (["BRBL_00419"])(1861)[Map showing the distribution of the slave population of the southern states of the United States, compiled from the census of 1860 / drawn by E. Hergesheimer ; engr. by Th. Leonhardt.]. https://collections.library.yale.edu/catalog/15603983.