Cite

Map of Philadelphia / Rand McNally & Co., Engravers.

MLA

McNally, Rand, and Company. Map of Philadelphia / Rand McNally & Co., Engravers. Rand McNally, 0AD. https://collections.library.yale.edu/catalog/15811123.

APA, 6th edition

McNally, R., & C. (0 C.E.). Map of Philadelphia / Rand McNally & Co., Engravers. [Maps]. Rand McNally, https://collections.library.yale.edu/catalog/15811123.