MLA

Lith., Walker, and Pub. Co. Map of Europe [Cartographic Material] / Walker Lithograph & Publishing Co. Walker LIthograph & Pub. Co., 1914. https://collections.library.yale.edu/catalog/15237910.

APA, 6th edition

Lith., W., & Co, P. (1914). Map of Europe [cartographic material] / Walker Lithograph & Publishing Co. [Maps]. Walker LIthograph & Pub. Co., https://collections.library.yale.edu/catalog/15237910.