MLA

Co, J. L. Smith. Smith's New Map of Philadelphia and Vicinity. J.L. Smith, 1881. https://collections.library.yale.edu/catalog/15811138.

APA, 6th edition

Co, J. L. S. (1881). Smith's new map of Philadelphia and vicinity. [Maps]. J.L. Smith, https://collections.library.yale.edu/catalog/15811138.