MLA

O'Shaughnessy, M. M. (Michael Maurice), 1864-1934. Street railway map of the city & county of San Francisco : 1929 / M.M. O'Shaughnessy, city engineer.. BRBL_00609. 1929]. https://collections.library.yale.edu/catalog/15818762.

APA, 6th edition

O'Shaughnessy, M. M. (Michael Maurice), 1864-1934. (["BRBL_00609"])(1929])[Street railway map of the city & county of San Francisco : 1929 / M.M. O'Shaughnessy, city engineer.]. https://collections.library.yale.edu/catalog/15818762.