MLA

Ltd, Edward Stanford. The United States of North America / Constructed & Engrd.at Stanford's Geographical Establishment. Edward Stanford, 1861. https://collections.library.yale.edu/catalog/15536506.

APA, 6th edition

Ltd, E. S. (1861). The United States of North America / constructed & engrd.at Stanford's Geographical Establishment. [Maps]. Edward Stanford, https://collections.library.yale.edu/catalog/15536506.