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THEWISSEN, J. G. M.; WILLIAMS, E. M.; ROE, L. J. Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls. Nature. 2001-09, roč. 413, čís. 6853, s. 277–281. Dostupné online [cit. 2024-06-03]. ISSN0028-0836. doi:10.1038/35095005. (anglicky)
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SPAULDING, Michelle; O'LEARY, Maureen A.; GATESY, John. Relationships of Cetacea (Artiodactyla) Among Mammals: Increased Taxon Sampling Alters Interpretations of Key Fossils and Character Evolution. PLoS ONE. 2009-09-23, roč. 4, čís. 9, s. e7062. Dostupné online [cit. 2024-06-03]. ISSN1932-6203. doi:10.1371/journal.pone.0007062. (anglicky)
THEWISSEN, J. G. M.; WILLIAMS, E. M.; ROE, L. J. Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls. Nature. 2001-09, roč. 413, čís. 6853, s. 277–281. Dostupné online [cit. 2024-06-03]. ISSN0028-0836. doi:10.1038/35095005. (anglicky)