Cite

Indian Ocean [cartographic material] / the Edinburgh Geographical Institute ; John Bartholomew & Co.

MLA

Edinburgh Geographical Institute, John Bartholomew, and Co. Indian Ocean [Cartographic Material] / the Edinburgh Geographical Institute ; John Bartholomew & Co. 1920. https://collections.library.yale.edu/catalog/15239200.

APA, 6th edition

Edinburgh Geographical Institute, J. B., & C. (1920). Indian Ocean [cartographic material] / the Edinburgh Geographical Institute ; John Bartholomew & Co. [Maps]. https://collections.library.yale.edu/catalog/15239200.