MLA

Palade, George E., and Philip Siekevitz. Cell Fractionation Guinea Pig Pancreas Rough Microsomes. Yale University School of Medicine, 2AD. https://collections.library.yale.edu/catalog/15817829.

APA, 6th edition

Palade, G. E., & Siekevitz, P. (2 C.E.). Cell Fractionation guinea pig pancreas rough microsomes [Transmission electron micrograph]. Yale University School of Medicine. https://collections.library.yale.edu/catalog/15817829.