MLA

Palade, George E. Guinea Pig Pancreas Morphology: Intracisternal Granules. Yale University School of Medicine, 5AD. https://collections.library.yale.edu/catalog/15817857.

APA, 6th edition

Palade, G. E. (5 C.E.). Guinea Pig Pancreas Morphology: intracisternal granules [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817857.