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Matthews, L. P. & Parks, S. E (2017). „Source levels and call parameters of harbor seal breeding vocalizations near a terrestrial haulout ite in Glacier Bay National Park and Preserve”. The Journal of the Acoustical Society of America. 141 (3): EL274—EL280. PMID28372144. doi:10.1121/1.4978299.
Manugian, S. C.; Greig, D.; Lee, D.; Becker, B. H.; Allen, S.; Lowry, M. S. & Harvey, J. T. (2017). „Survival probabilities and movements of harbor seals in central California”. Marine Mammal Science. 33: 154—171. doi:10.1111/mms.12350.
Daryl Boness and W. Don Bowen, "The Evolution of Maternal Care in Pinnipeds", BioScience. 46(9):645-654. 1996. . JSTOR1312894.Недостаје или је празан параметар |title= (помоћ)
Matthews, L. P. & Parks, S. E (2017). „Source levels and call parameters of harbor seal breeding vocalizations near a terrestrial haulout ite in Glacier Bay National Park and Preserve”. The Journal of the Acoustical Society of America. 141 (3): EL274—EL280. PMID28372144. doi:10.1121/1.4978299.
Härkönen, T.; Heide-Jørgensen, M.-P. (1. 12. 1990). „Comparative life histories of East Atlantic and other harbour seal populations”. Ophelia. 32 (3): 211—235. ISSN0078-5326. doi:10.1080/00785236.1990.10422032.