MLA

Palade, George E. Intestine Rat Colon Mucosa Goblet Cells. Yale University School of Medicine, 2AD. https://collections.library.yale.edu/catalog/15817907.

APA, 6th edition

Palade, G. E. (2 C.E.). Intestine rat colon mucosa goblet cells [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817907.