MLA

Palade, George E. Liver 1 Day Old Rat Nuclear Pores. Yale University School of Medicine, 2AD. https://collections.library.yale.edu/catalog/15817924.

APA, 6th edition

Palade, G. E. (2 C.E.). Liver 1 Day old rat nuclear pores [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817924.