Map showing the Union Pacific Railway and connecting railroads / prepared by G.W. & C.B. Colton & Co.
MLA
G. W., et al. Map Showing the Union Pacific Railway and Connecting Railroads / Prepared by G.W. & C.B. Colton & Co. [G.W. & C.B. Colton], 1885. https://collections.library.yale.edu/catalog/15813029.
APA, 6th edition
G. W., Colton, C. B., & C. (1885). Map showing the Union Pacific Railway and connecting railroads / prepared by G.W. & C.B. Colton & Co. [Maps]. [G.W. & C.B. Colton], https://collections.library.yale.edu/catalog/15813029.