MLA

Pierce, C. C., and Co. [Photograph of Saguaro Cactus]. 0AD. https://collections.library.yale.edu/catalog/2017621.

APA, 6th edition

Pierce, C. C., & C. (0 C.E.). [Photograph of Saguaro cactus] [Photographic prints, Photographs]. https://collections.library.yale.edu/catalog/2017621.