Cite

Ashburn's map of Oklahoma City, Okla.

MLA

Ashburn, J. Foster (John Foster). Ashburn's map of Oklahoma City, Okla.. BRBL_00578. [1942?]. https://collections.library.yale.edu/catalog/15814890.

APA, 6th edition

Ashburn, J. Foster (John Foster). (["BRBL_00578"])([1942?])[Ashburn's map of Oklahoma City, Okla.]. https://collections.library.yale.edu/catalog/15814890.