1931 official road map, Nebraska / [prepared for] Shell.
MLA
Company, H. M. Gousha. 1931 Official Road Map, Nebraska / [Prepared for] Shell. H.M. Gousha Company, 0AD. https://collections.library.yale.edu/catalog/15814801.
APA, 6th edition
Company, H. M. G. (0 C.E.). 1931 official road map, Nebraska / [prepared for] Shell. [Road maps]. H.M. Gousha Company, https://collections.library.yale.edu/catalog/15814801.