MLA

Eaton, Edric L. Broadway, Council Bluffs, ID. Eaton, 1866. https://collections.library.yale.edu/catalog/2011421.

APA, 6th edition

Eaton, E. L. (1866). Broadway, Council Bluffs, ID [Card photographs, Cartes-de-visite, Photographic prints, Photographs]. Eaton. https://collections.library.yale.edu/catalog/2011421.