MLA

Geographia Ltd, Gross, Alexander, 1879-1958. The Daily telegraph war map no. 15 [cartographic material] : of the western front, Verdun to Belfort / By Alexander Gross ; Geographia Ltd.. BRBL_00010V. [1916?]. https://collections.library.yale.edu/catalog/15238190.

APA, 6th edition

Geographia Ltd, & Gross, Alexander, 1879-1958. (["BRBL_00010V"])([1916?])[The Daily telegraph war map no. 15 [cartographic material] : of the western front, Verdun to Belfort / By Alexander Gross ; Geographia Ltd.]. https://collections.library.yale.edu/catalog/15238190.