MLA

Hayward & Muzzall, Hayward, E. J., b. 1838. [Photograph of campsite under trees]. Box 18 | Folder : Hayward & Muzzall. undated. https://collections.library.yale.edu/catalog/10466797.

APA, 6th edition

Hayward & Muzzall, & Hayward, E. J., b. 1838. (["Box 18 | Folder : Hayward & Muzzall"])(undated)[[Photograph of campsite under trees]]. https://collections.library.yale.edu/catalog/10466797.