MLA

Maggio, R., and George E. Palade. Cell Fractionation Guinea Pig Liver Nucleolar Fraction. Yale University School of Medicine, 2AD. https://collections.library.yale.edu/catalog/15817827.

APA, 6th edition

Maggio, R., & Palade, G. E. (2 C.E.). Cell Fractionation guinea pig liver nucleolar fraction [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817827.