MLA

Palade, George E. Exocytosis Guinea Pig Pancreas. Yale University School of Medicine, 5AD. https://collections.library.yale.edu/catalog/15817836.

APA, 6th edition

Palade, G. E. (5 C.E.). Exocytosis Guinea Pig Pancreas [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817836.