Citations:Shirley card


 * 2019, I. Linkov, L. Roslycky, B.D. Trump, Resilience and Hybrid Threats, IOS Press (ISBN 9781643680231), page 52:
 * Also importantly, even though photographers recognized the limitations of the Shirley card, the system, once established, was slow to correct itself.


 * 2019, Ruha Benjamin, Captivating Technology, Duke University Press (ISBN 9781478004493)
 * The purpose of a Shirley card was to aid in the determination of exposure, image density, comparison-measuring, and calibrating the skin tones on photographs being printed.