Cite

Official highway map of Idaho.

MLA

McNally, Rand, and Company. Official Highway Map of Idaho. issued by Idaho Department of Highways,, Rand McNally ; 1956. https://collections.library.yale.edu/catalog/15818351.

APA, 6th edition

McNally, R., & C. (1956). Official highway map of Idaho. [Road maps]. issued by Idaho Department of Highways,, Rand McNally ; https://collections.library.yale.edu/catalog/15818351.