MLA

Jamieson, James D. Bacteria Diplococcus Pneumoniae. Yale University School of Medicine, 2AD. https://collections.library.yale.edu/catalog/15817805.

APA, 6th edition

Jamieson, J. D. (2 C.E.). Bacteria Diplococcus pneumoniae [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817805.