MLA

Edinburgh Geographical Institute, John Bartholomew, and Co. Bartholomew's General War Map of Europe and the Mediterranean [Cartographic Material] / John Bartholomew & Co. Edinburgh Geographical Institute, 0AD. https://collections.library.yale.edu/catalog/15237896.

APA, 6th edition

Edinburgh Geographical Institute, J. B., & C. (0 C.E.). Bartholomew's general war map of Europe and the Mediterranean [cartographic material] / John Bartholomew & Co. [Maps]. Edinburgh Geographical Institute, https://collections.library.yale.edu/catalog/15237896.