MLA

Kravitt, Samuel, and Yale University School of Medicine. Joseph S. Fruton. Samuel Kravitt Photography, 0AD. https://collections.library.yale.edu/catalog/16787553.

APA, 6th edition

Kravitt, S., & of Medicine, Y. U. S. (0 C.E.). Joseph S. Fruton [Photograph]. Samuel Kravitt Photography. https://collections.library.yale.edu/catalog/16787553.