MLA

Jamieson, James D. Heart Guinea Pig Left Atrium. Yale University School of Medicine, 2AD. https://collections.library.yale.edu/catalog/15817889.

APA, 6th edition

Jamieson, J. D. (2 C.E.). Heart Guinea pig left atrium [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817889.