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- Formerly included, now transferred to Suliformes: Anhingidae - Fregatidae - Phalacrocoracidae - Sulidae
- Formerly included, now transferred to Phaethontiformes: Phaethontidae – †Prophaethontidae
- Sharpe, R.B. 1891. A review of recent attempts to classify birds; an address delivered before the Second International Ornithological Congress on the 18th of May, 1891. DOI: 10.5962/bhl.title.13335 BHL Reference page.
- Hackett, S.J. et al. 2008. A Phylogenomic Study of Birds Reveals Their Evolutionary History. Science 320: 1763–1768.
- Jarvis, E.D. et al. 2014. Whole-genome analyses resolve early branches in the tree of life of modern birds. Science 346: 1320–1331.