Wynen, L.P. et al.; Goldsworthy, SD; Insley, SJ; Adams, M; Bickham, JW; Francis, J; Gallo, JP; Hoelzel, AR και άλλοι. (2001). «Phylogenetic relationships within the eared seals (Otariidae: Carnivora): implications for the historical biogeography of the family». Mol. Phylog. Evol.21 (2): 270–284. doi:10.1006/mpev.2001.1012. PMID11697921.
Wynen, L.P. et al.; Goldsworthy, SD; Insley, SJ; Adams, M; Bickham, JW; Francis, J; Gallo, JP; Hoelzel, AR και άλλοι. (2001). «Phylogenetic relationships within the eared seals (Otariidae: Carnivora): implications for the historical biogeography of the family». Mol. Phylog. Evol.21 (2): 270–284. doi:10.1006/mpev.2001.1012. PMID11697921.