Berta, A.; Churchill, M.; Boessenecker, R.W. (2018). The Origin and Evolutionary Biology of Pinnipeds: Seals, Sea Lions, and Walruses. Annual Review of Earth and Planetary Sciences. 46: 203—228. Bibcode:2018AREPS..46..203B. doi:10.1146/annurev-earth-082517-010009.
Berta, A.; Churchill, M.; Boessenecker, R.W. (2018). The Origin and Evolutionary Biology of Pinnipeds: Seals, Sea Lions, and Walruses. Annual Review of Earth and Planetary Sciences. 46: 203—228. Bibcode:2018AREPS..46..203B. doi:10.1146/annurev-earth-082517-010009.