MLA

Section, Great Britain. War Office. General Staff. Geographical. Africa Road Map 1:2,000,000 and 1:500,000, Maroc-Algerie-Tunisie. GSGS, 1942. https://collections.library.yale.edu/catalog/15534041.

APA, 6th edition

Section, G. B. W. O. G. S. G. (1942). Africa road map 1:2,000,000 and 1:500,000, Maroc-Algerie-Tunisie. [Maps]. GSGS, https://collections.library.yale.edu/catalog/15534041.