MLA

Palade, George E., and K. Porter. Muscle Rat Sartorius. Yale University School of Medicine, 7AD. https://collections.library.yale.edu/catalog/15817941.

APA, 6th edition

Palade, G. E., & Porter, K. (7 C.E.). Muscle Rat sartorius [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817941.