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. A.L. Bancroft & Co., 1873. https://collections.library.yale.edu/catalog/15818751.

APA, 6th edition

Bancroft, A. L., & C. (1873). Bancroft's official guide map of city and county of San Francisco: compiled from official maps in Surveyor's Office. [Maps]. A.L. Bancroft & Co., https://collections.library.yale.edu/catalog/15818751.