MLA

Dept, New Mexico. State Highway. Official Road Map of New Mexico / Issued by New Mexico State Highway Department ; State Highway Commission. The Department, 1941. https://collections.library.yale.edu/catalog/15818583.

APA, 6th edition

Dept, N. M. S. H. (1941). Official road map of New Mexico / issued by New Mexico State Highway Department ; State Highway Commission. [Road maps]. The Department, https://collections.library.yale.edu/catalog/15818583.