MLA

Palade, George E. Capillary Guinea Pig Pancreas; Discontinuous Endothelium; Pericyte; Red Blood Cell in Lumen. Yale University School of Medicine, 2AD. https://collections.library.yale.edu/catalog/15817810.

APA, 6th edition

Palade, G. E. (2 C.E.). Capillary guinea pig pancreas; discontinuous endothelium; pericyte; red blood cell in lumen [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817810.