Holley RW et al. Structure of a ribonucleic acid // Science. — 1965. — Т. 147, № 1664. — С. 1462–65. — DOI:10.1126/science.147.3664.1462.
Szathmáry E. The origin of the genetic code: amino acids as cofactors in an RNA world // Trends Genet.. — 1999. — Т. 15, № 6. — С. 223–9. — DOI:10.1016/S0168-9525(99)01730-8.