Cite

Kenyon's Map of the western battle front [cartographic material] : "The battle ground of freedom" where our boys are fighting.

MLA

Kenyon Company (Des Moines, Iowa). Kenyon's Map of the western battle front [cartographic material] : "The battle ground of freedom" where our boys are fighting.. BRBL_00010F. 1918. https://collections.library.yale.edu/catalog/15237969.

APA, 6th edition

Kenyon Company (Des Moines, Iowa). (["BRBL_00010F"])(1918)[Kenyon's Map of the western battle front [cartographic material] : "The battle ground of freedom" where our boys are fighting.]. https://collections.library.yale.edu/catalog/15237969.