Lowry L (2016). "Odobenus rosmarus". 2016: e.T15106A45228501. doi:10.2305/IUCN.UK.2016-1.RLTS.T15106A45228501.en.|erişim-tarihi= kullanmak için |url= gerekiyor (yardım) Database entry includes a brief justification of why this species is considered Vulnerable