MLA

Palade, George E. Unicellular Organisms Yellow Chlamydomonas Cross Section Flagellum. Yale University School of Medicine, 1AD. https://collections.library.yale.edu/catalog/15817986.

APA, 6th edition

Palade, G. E. (1 C.E.). Unicellular Organisms Yellow Chlamydomonas cross section flagellum [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817986.