MLA

De Witt, Frederic M. DeWitt's Indexed Map of the City of San Francisco Compiled from the Latest Official Data. Frederic M. DeWitt Map and Guide Publisher, 0AD. https://collections.library.yale.edu/catalog/15818755.

APA, 6th edition

De Witt, F. M. (0 C.E.). DeWitt's indexed map of the city of San Francisco compiled from the latest official data. [Maps]. Frederic M. DeWitt Map and Guide Publisher, https://collections.library.yale.edu/catalog/15818755.