Cite

Northern Italy ethnographical map [cartographic material].

MLA

Section, Great Britain. War Office. General Staff. Geographical. Northern Italy Ethnographical Map [Cartographic Material]. War Office [G.S.G.S.], 1918. https://collections.library.yale.edu/catalog/15493663.

APA, 6th edition

Section, G. B. W. O. G. S. G. (1918). Northern Italy ethnographical map [cartographic material]. [Maps]. War Office [G.S.G.S.], https://collections.library.yale.edu/catalog/15493663.