MLA

Colton, J. H., and Co. Nebraska and Kansas. J.H. Colton & Co., 0AD. https://collections.library.yale.edu/catalog/15814770.

APA, 6th edition

Colton, J. H., & C. (0 C.E.). Nebraska and Kansas. [Maps]. J.H. Colton & Co., https://collections.library.yale.edu/catalog/15814770.