1931 official road map, North Dakota / this map showing main trunk and highways is distributed with the compliments of Standard Oil Company (Indiana).
MLA
Company, H. M. Gousha. 1931 Official Road Map, North Dakota / This Map Showing Main Trunk and Highways Is Distributed with the Compliments of Standard Oil Company (Indiana). H.M. Gousha, 0AD. https://collections.library.yale.edu/catalog/15814738.
APA, 6th edition
Company, H. M. G. (0 C.E.). 1931 official road map, North Dakota / this map showing main trunk and highways is distributed with the compliments of Standard Oil Company (Indiana). [Road maps]. H.M. Gousha, https://collections.library.yale.edu/catalog/15814738.
