Cite

Map of the city and county of San Francisco : 1927 / prepared by the Board of Public Works ; M.M. O'Shaughnessy, City Engineer ; A.L. Auradou, cartographer.

MLA

O'Shaughnessy, M. M. (Michael Maurice), 1864-1934. Map of the city and county of San Francisco : 1927 / prepared by the Board of Public Works ; M.M. O'Shaughnessy, City Engineer ; A.L. Auradou, cartographer.. BRBL_00609. 1927. https://collections.library.yale.edu/catalog/15818761.

APA, 6th edition

O'Shaughnessy, M. M. (Michael Maurice), 1864-1934. (["BRBL_00609"])(1927)[Map of the city and county of San Francisco : 1927 / prepared by the Board of Public Works ; M.M. O'Shaughnessy, City Engineer ; A.L. Auradou, cartographer.]. https://collections.library.yale.edu/catalog/15818761.