Cite

Africa 1:250 000. British Central Africa. Blantyre. Sheet III-P [cartographic material].

MLA

Section, Great Britain. War Office. General Staff. Geographical. Africa 1:250 000. British Central Africa. Blantyre. Sheet III-P [Cartographic Material]. Ordnance Survey, 1901. https://collections.library.yale.edu/catalog/15952192.

APA, 6th edition

Section, G. B. W. O. G. S. G. (1901). Africa 1:250 000. British Central Africa. Blantyre. Sheet III-P [cartographic material]. [Maps]. Ordnance Survey, https://collections.library.yale.edu/catalog/15952192.