Cite

Western Germany, with Holland, Belgium and Switzerland.

MLA

Philip, George, and London Geographical Institute Son. Western Germany, with Holland, Belgium and Switzerland. George Philip and Son, 1940. https://collections.library.yale.edu/catalog/15476418.

APA, 6th edition

Philip, G., & Son, L. G. I. (1940). Western Germany, with Holland, Belgium and Switzerland. [Maps]. George Philip and Son, https://collections.library.yale.edu/catalog/15476418.