Cite

Southwestern United States : Texas, New Mexico, Oklahoma, Arkansas, Louisiana.

MLA

McNally, Rand, and Company. Southwestern United States : Texas, New Mexico, Oklahoma, Arkansas, Louisiana. Rand McNally, 0AD. https://collections.library.yale.edu/catalog/15811223.

APA, 6th edition

McNally, R., & C. (0 C.E.). Southwestern United States : Texas, New Mexico, Oklahoma, Arkansas, Louisiana. [Maps]. Rand McNally, https://collections.library.yale.edu/catalog/15811223.