Blue Hawk
MLA
Eaton, Edric L. Blue Hawk. Eaton, 0AD. https://collections.library.yale.edu/catalog/2011417.
APA, 6th edition
Eaton, E. L. (0 C.E.). Blue Hawk [Card photographs, Cartes-de-visite, Photographic prints, Photographs, Studio portraits]. Eaton. https://collections.library.yale.edu/catalog/2011417.