The Rand McNally new commercial atlas map of Illinois / Rand McNally & Co.
MLA
McNally, Rand, and Company. The Rand McNally New Commercial Atlas Map of Illinois / Rand McNally & Co. Rand McNally & Co., 1918. https://collections.library.yale.edu/catalog/15952236.
APA, 6th edition
McNally, R., & C. (1918). The Rand McNally new commercial atlas map of Illinois / Rand McNally & Co. [Maps]. Rand McNally & Co., https://collections.library.yale.edu/catalog/15952236.