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Robert Whittaker (1969). «New concepts of kingdoms or organisms. Evolutionary relations are better represented by new classifications than by the traditional two kingdoms». Science. 163: 150–160. PMID5762760. doi:10.1126/science.163.3863.150
WOESE, C.R.; BALCH, W.E.; MAGRUM, L.J.; FOX, G.E.; WOLFE, R.S. (1977). «An ancient divergence among the bacteria». Journal of Molecular Evolution. 9 (4): 305–311. PMID408502. doi:10.1007/BF01796092 !CS1 manut: Nomes múltiplos: lista de autores (link)