Map of Omaha, Nebraska / Office of City Engineer.
MLA
Omaha (Neb.). Office of City Engineer. Map of Omaha, Nebraska / Office of City Engineer.. BRBL_00572. [1930]. https://collections.library.yale.edu/catalog/15814806.
APA, 6th edition
Omaha (Neb.). Office of City Engineer. (["BRBL_00572"])([1930])[Map of Omaha, Nebraska / Office of City Engineer.]. https://collections.library.yale.edu/catalog/15814806.