The Nobel Prize in Physiology or Medicine 1968, su nobelprize.org, The Royal Swedish Academy of Science, 1968. URL consultato il 27 febbraio 2010.
«The Nobel Prize in Physiology or Medicine 1968 was awarded jointly to Robert W. Holley, Har Gobind Khorana and Marshall W. Nirenberg 'for their interpretation of the genetic code and its function in protein synthesis'.»