MLA

Gross, Alexander, 1879-1958. The Daily telegraph war map no. 12 [cartographic material] : [of the Gallipoli Peninsula] / by Alexander Gross; produced by "Geographia" Ltd.. BRBL_00270. [1915?]. https://collections.library.yale.edu/catalog/15502076.

APA, 6th edition

Gross, Alexander, 1879-1958. (["BRBL_00270"])([1915?])[The Daily telegraph war map no. 12 [cartographic material] : [of the Gallipoli Peninsula] / by Alexander Gross; produced by "Geographia" Ltd.]. https://collections.library.yale.edu/catalog/15502076.