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Lloyd, G. T.; Slater, G. J. (2021). "A total-group phylogenetic metatree for Cetacea and the importance of fossil data in diversification analyses". Systematic Biology. 70 (5): 922–939. doi:10.1093/sysbio/syab002. PMID33507304Periksa nilai |pmid= (bantuan).
Davydenko, S.; Shevchenko, T.; Ryabokon, T.; Tretiakov, R.; Gol’din, P. (2021). "A Giant Eocene Whale from Ukraine Uncovers Early Cetacean Adaptations to the Fully Aquatic Life". Evolutionary Biology. 48 (1): 67–80. doi:10.1007/s11692-020-09524-8.Parameter |s2cid= yang tidak diketahui akan diabaikan (bantuan)
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Lloyd, G. T.; Slater, G. J. (2021). "A total-group phylogenetic metatree for Cetacea and the importance of fossil data in diversification analyses". Systematic Biology. 70 (5): 922–939. doi:10.1093/sysbio/syab002. PMID33507304Periksa nilai |pmid= (bantuan).