MLA

Merine, and Williams. [Unidentified Portait]. 0AD. https://collections.library.yale.edu/catalog/2010989.

APA, 6th edition

M., & W. (0 C.E.). [Unidentified portait] [Card photographs, Cartes-de-visite, Photographic prints, Photographs, Studio portraits]. https://collections.library.yale.edu/catalog/2010989.