MLA

Philip, George, and London Geographical Institute Son. Eastern Germany, with Hungary. George Philip and Son, 1940. https://collections.library.yale.edu/catalog/15476421.

APA, 6th edition

Philip, G., & Son, L. G. I. (1940). Eastern Germany, with Hungary. [Maps]. George Philip and Son, https://collections.library.yale.edu/catalog/15476421.