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Fulton, Tara L.; Strobeck, Curtis (2010). "Multiple fossil calibrations, nuclear loci and mitochondrial genomes provide new insight into biogeography and divergence timing for true seals (Phocidae, Pinnipedia)". Journal of Biogeography. 37 (5): 814–829. Bibcode:2010JBiog..37..814F. doi:10.1111/j.1365-2699.2010.02271.x. S2CID59436229.
Árnason, Úlfur; Bodin, Kristina; Gullberg, Anette; Ledje, Christina; Suzette, Mouchaty (1995). "A molecular view of pinniped relationships with particular emphasis on the true seals". Journal of Molecular Evolution. 40 (1): 78–85. Bibcode:1995JMolE..40...78A. doi:10.1007/BF00166598. PMID7714914. S2CID7537924.
Arnason, Ulfur; Gullberg, Anette; Janke, Axel; Kullberg, Morgan; Lehman, Niles; Petrov, Evgeny A.; Väinölä, Risto (2006-11-01). "Pinniped phylogeny and a new hypothesis for their origin and dispersal". Molecular Phylogenetics and Evolution. 41 (2): 345–354. doi:10.1016/j.ympev.2006.05.022. PMID16815048.
Fulton, Tara L.; Strobeck, Curtis (2010). "Multiple fossil calibrations, nuclear loci and mitochondrial genomes provide new insight into biogeography and divergence timing for true seals (Phocidae, Pinnipedia)". Journal of Biogeography. 37 (5): 814–829. Bibcode:2010JBiog..37..814F. doi:10.1111/j.1365-2699.2010.02271.x. S2CID59436229.