MLA

Section, Great Britain. War Office. General Staff. Topographical. Gold Coast / Compiled in the Topographical Section, General Staff 1906. War Office, 1907. https://collections.library.yale.edu/catalog/15827275.

APA, 6th edition

Section, G. B. W. O. G. S. T. (1907). Gold Coast / compiled in the Topographical Section, General Staff 1906. [Maps]. War Office, https://collections.library.yale.edu/catalog/15827275.