Northern Nigeria / compiled in the War Office from boundary commission surveys and road traverses adjusted on certain towns fixed by latitudes and telegraphic longitudes.
MLA
Section, Great Britain. War Office. General Staff. Geographical. Northern Nigeria / Compiled in the War Office from Boundary Commission Surveys and Road Traverses Adjusted on Certain Towns Fixed by Latitudes and Telegraphic Longitudes. War Office, 1909. https://collections.library.yale.edu/catalog/15533570.
APA, 6th edition
Section, G. B. W. O. G. S. G. (1909). Northern Nigeria / compiled in the War Office from boundary commission surveys and road traverses adjusted on certain towns fixed by latitudes and telegraphic longitudes. [Maps]. War Office, https://collections.library.yale.edu/catalog/15533570.
