MLA

Section, Great Britain. War Office. General Staff. Geographical. The Islands of Bermuda [Cartographic Material]. Ordnance Survey Office, 1927. https://collections.library.yale.edu/catalog/16682161.

APA, 6th edition

Section, G. B. W. O. G. S. G. (1927). The islands of Bermuda [cartographic material]. [Booksellers' labels (Provenance), Maps]. Ordnance Survey Office, https://collections.library.yale.edu/catalog/16682161.