MLA

Colton, J. H., and Co. Nebraska and Kansas. J.H. Colton & Co., 1857. https://collections.library.yale.edu/catalog/15814773.

APA, 6th edition

Colton, J. H., & C. (1857). Nebraska and Kansas. [Maps]. J.H. Colton & Co., https://collections.library.yale.edu/catalog/15814773.