Nobel prize for George Wald, Haldan Keffer Hartline and Ragner Granit in 1967 for discoveries concerning the primary biochemical and physiological phenomena occurring in the process of vision. Wiadomosci lekarskie (Warsaw, Poland : 1960), 1969, s. 1258–1259. PMID 4897321.
The Nobel Prize in Medicine, 1967. Annales d'oculistique, 1968, s. 257–269. PMID 4877173.
Ragnar Garnit, Haldan Keffer Hartline, George Wald, winners of the Nobel Prize in physiology and medicine. Nederlands tijdschrift voor geneeskunde, 1968, s. 23–25. PMID 4875782.
The Nobel prize for physiology or medicine. Nordisk medicin, 1967, s. 1429–1434. PMID 4864608.