MLA

Palade, George E. Guinea Pig Pancreas Morphology: Classic RER High Magnification. Yale University School of Medicine, 10AD. https://collections.library.yale.edu/catalog/15817854.

APA, 6th edition

Palade, G. E. (10 C.E.). Guinea Pig Pancreas Morphology: Classic RER high magnification [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817854.