MLA

Ltd., Edward Stanford. A Language Map of Further India and the Indian Archipelago [Cartographic Material]. Stanford's Geogl. Estabt., 0AD. https://collections.library.yale.edu/catalog/16729345.

APA, 6th edition

Ltd., E. S. (0 C.E.). A language map of further India and the Indian archipelago [cartographic material]. [Maps]. Stanford's Geogl. Estabt., https://collections.library.yale.edu/catalog/16729345.