Map of the western states / by J.M. Atwood.
MLA
Atwood, John M., b. ca. 1818. Map of the western states / by J.M. Atwood.. BRBL_00416. 1856, c1848.. https://collections.library.yale.edu/catalog/15603945.
APA, 6th edition
Atwood, John M., b. ca. 1818. (["BRBL_00416"])(1856, c1848.)[Map of the western states / by J.M. Atwood.]. https://collections.library.yale.edu/catalog/15603945.