MLA

Hammond, C. S., and Company. Hammond's Map of the Mediterranean, Europe and Northern Africa [Cartographic Material]. C.S. Hammond & Co., 0AD. https://collections.library.yale.edu/catalog/15238300.

APA, 6th edition

Hammond, C. S., & C. (0 C.E.). Hammond's map of the Mediterranean, Europe and Northern Africa [cartographic material]. [Maps]. C.S. Hammond & Co., https://collections.library.yale.edu/catalog/15238300.