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Whittaker RH«New concepts of kingdoms or organisms. Evolutionary relations are better represented by new classifications than by the traditional two kingdoms»(en anglès).Science,163,863,Gener 1969,p.150–60. DOI: 10.1126/science.163.3863.150. PMID: 5762760.
Adl S. M., Simpson A. G., Farmer M. A., et al.«The new higher level classification of eukaryotes with emphasis on the taxonomy of protists»(en anglès).J. Eukaryot. Microbiol.,52,5,2005,p.399–451. DOI: 10.1111/j.1550-7408.2005.00053.x. PMID: 16248873.