MLA

Commission, New Mexico State Highway. Map Showing Condition of State Roads, State of New Mexico / Issued by State Highway Commission. State Highway Commission, 1918. https://collections.library.yale.edu/catalog/15818577.

APA, 6th edition

Commission, N. M. S. H. (1918). Map showing condition of state roads, state of New Mexico / issued by State Highway Commission. [Road maps]. State Highway Commission, https://collections.library.yale.edu/catalog/15818577.