MLA

McNally, Rand, and Company. Railroad Map of South Dakota / Prepared under the Direction of, and Presented by, the Board of Railroad Commissioners. Rand McNally?], 0AD. https://collections.library.yale.edu/catalog/15814766.

APA, 6th edition

McNally, R., & C. (0 C.E.). Railroad map of South Dakota / prepared under the direction of, and presented by, the Board of Railroad Commissioners. [Maps]. Rand McNally?], https://collections.library.yale.edu/catalog/15814766.