MLA

Company, Union Pacific Railway. Monarch of the West : Corn Is King and How It Rules in Nebraska. Union Pacific Ry Cos Land Department, 0AD. https://collections.library.yale.edu/catalog/2032087.

APA, 6th edition

Company, U. P. R. (0 C.E.). Monarch of the West : Corn is king and how it rules in Nebraska. [Advertisements, Illustrations, Promotional literature, Wood engravings]. Union Pacific Ry Cos Land Department. https://collections.library.yale.edu/catalog/2032087.