Cite

Africa 1:1 000 000. Lake Victoria [cartographic material] / drawn at the War Office ; engraved by W. & A.K. Johnson, Limited.

MLA

Section, Great Britain. War Office. General Staff. Geographical. Africa 1:1 000 000. Lake Victoria [Cartographic Material] / Drawn at the War Office ; Engraved by W. & A.K. Johnson, Limited. Printed at the War Office, 1910. https://collections.library.yale.edu/catalog/15532764.

APA, 6th edition

Section, G. B. W. O. G. S. G. (1910). Africa 1:1 000 000. Lake Victoria [cartographic material] / drawn at the War Office ; engraved by W. & A.K. Johnson, Limited. [Maps]. Printed at the War Office, https://collections.library.yale.edu/catalog/15532764.