MLA

Wyld, James, 1812-1887. The United States & the relative position of the Northern states and the Southern Confederated states / by James Wyld, Charing Cross East.. BRBL_00402. [1861?]. https://collections.library.yale.edu/catalog/15536505.

APA, 6th edition

Wyld, James, 1812-1887. (["BRBL_00402"])([1861?])[The United States & the relative position of the Northern states and the Southern Confederated states / by James Wyld, Charing Cross East.]. https://collections.library.yale.edu/catalog/15536505.