MLA

Weston, J. [Photographic Portrait of William George Herbert]. J. Weston & Son, 0AD. https://collections.library.yale.edu/catalog/2005011.

APA, 6th edition

Weston, J. (0 C.E.). [Photographic portrait of William George Herbert] [Card photographs, Photographic prints, Photographs]. J. Weston & Son. https://collections.library.yale.edu/catalog/2005011.