MLA

Map of San Francisco, Calif., 1847. 1847. https://collections.library.yale.edu/catalog/2035548.

APA, 6th edition

Map of San Francisco, Calif., 1847. (1847). [Autographs, Cityscapes (Representations), Manuscripts, Maps, Territorial records, Townscapes (Built environment)]. https://collections.library.yale.edu/catalog/2035548.