Cite

Colorado and Denver / [prepared for] Sinclair Oil.

MLA

McNally, Rand, and Company. Colorado and Denver / [Prepared for] Sinclair Oil. Rand McNally& Co., 0AD. https://collections.library.yale.edu/catalog/15818469.

APA, 6th edition

McNally, R., & C. (0 C.E.). Colorado and Denver / [prepared for] Sinclair Oil. [Road maps]. Rand McNally& Co., https://collections.library.yale.edu/catalog/15818469.