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Gingerich, P. D.; Heissig, K.; Bebej, R. M.; von Koenigswald, W. (2017). "Astragali of Pakicetidae and other early-to-middle Eocene archaeocetes (Mammalia, Cetacea) of Pakistan: Locomotion and habitat in the initial stages of whale evolution". PalZ. 91 (4): 601–627. Bibcode:2017PalZ...91..601G. doi:10.1007/s12542-017-0362-8.
Thewissen, J. G. M.; Williams, E. M.; Roe, L. J.; Hussain, S. T. (2001). "Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls". Nature. 413 (6853): 277–281. Bibcode:2001Natur.413..277T. doi:10.1038/35095005. PMID11565023.
Gingerich, P. D.; Haq, M.; Zalmout, I. S.; Khan, I. H.; Malkani, M. S. (2001). "Origin of whales from early artiodactyls: Hands and feet of Eocene Protocetidae from Pakistan". Science. 293 (5538): 2239–2242. Bibcode:2001Sci...293.2239G. doi:10.1126/science.1063902. PMID11567134.
Gingerich, P. D.; Wells, N. A.; Russell, D. E.; Ibrahim Shah, S. M. (1983). "Origin of whales in epicontinental seas: New evidence from the early Eocene of Pakistan". Science. 220 (4595): 403–406. doi:10.1126/science.220.4595.403. PMID17831411.
Thewissen, J. G. M.; Williams, E. M.; Roe, L. J.; Hussain, S. T. (2001). "Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls". Nature. 413 (6853): 277–281. Bibcode:2001Natur.413..277T. doi:10.1038/35095005. PMID11565023.
Fish, F. E. (2016). "Secondary evolution of aquatic propulsion in higher vertebrates: Validation and prospect". Integrative and Comparative Biology. 56 (6): 1285–1297. doi:10.1093/icb/icw123. PMID27697779.
Gingerich, P. D.; Haq, M.; Zalmout, I. S.; Khan, I. H.; Malkani, M. S. (2001). "Origin of whales from early artiodactyls: Hands and feet of Eocene Protocetidae from Pakistan". Science. 293 (5538): 2239–2242. Bibcode:2001Sci...293.2239G. doi:10.1126/science.1063902. PMID11567134.