MLA

Company, H. M. Gousha. 1939 Official Road Map, Nebraska / [Prepared for] Phillips Petroleum Company. H.M. Gousha Company, 1939. https://collections.library.yale.edu/catalog/15814804.

APA, 6th edition

Company, H. M. G. (1939). 1939 official road map, Nebraska / [prepared for] Phillips Petroleum Company. [Road maps]. H.M. Gousha Company, https://collections.library.yale.edu/catalog/15814804.