Cite

Map of Europe showing countries as established by the Peace Conference at Paris / prepared especially for the National Geographic magazine by the Matthews-Northrup Works.

MLA

Matthews-Northrup Company, National Geographic Society (U.S.). Map of Europe showing countries as established by the Peace Conference at Paris / prepared especially for the National Geographic magazine by the Matthews-Northrup Works.. BRBL_00032A. 1920. https://collections.library.yale.edu/catalog/15258820.

APA, 6th edition

Matthews-Northrup Company, & National Geographic Society (U.S.). (["BRBL_00032A"])(1920)[Map of Europe showing countries as established by the Peace Conference at Paris / prepared especially for the National Geographic magazine by the Matthews-Northrup Works.]. https://collections.library.yale.edu/catalog/15258820.