(en) Stephen Kinzer, chap. 4 « The Secret That Was Going to Unlock the Universe », dans Poisoner in Chief : Sidney Gottlieb and the CIA Search for Mind Control, New York, Henry Holt & Company, , 320 p. (ISBN9781250140449, LCCN2019007076)
(en) Alfred W. McCoy, « Science in Dachau's shadow : Hebb, Beecher, and the development of CIA psychological torture and modern medical ethics », Journal of the History of the Behavioral Sciences, vol. 43(4), , p. 401-417 (lire en ligne)