MLA

Bancroft, A. L., and Company. Bancroft's Official Guide Map of City and County of San Francisco : Compiled from Official Maps in Surveyor's Office. Bancroft Co., 1893. https://collections.library.yale.edu/catalog/15818753.

APA, 6th edition

Bancroft, A. L., & C. (1893). Bancroft's official guide map of city and county of San Francisco : compiled from official maps in Surveyor's Office. [Maps]. Bancroft Co., https://collections.library.yale.edu/catalog/15818753.