MLA

Jamieson, James D. Zymogen Granule Fraction Guinea Pig Pancreas Intermediate Magnification. Yale University School of Medicine, 4AD. https://collections.library.yale.edu/catalog/15817991.

APA, 6th edition

Jamieson, J. D. (4 C.E.). Zymogen granule fraction guinea pig pancreas intermediate magnification [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817991.