• [Wiki] https://en.wikipedia.org/wiki/Harp_seal.
• [AnAge] http://genomics.senescence.info/species/entry.php?species=Pagophilus_groenlandicus.
• [AWD] http://animaldiversity.org/accounts/Pagophilus_groenlandicus/.
• [npolar] http://www.npolar.no/en/species/harp-seal.html.
• [InneStew1981] Innes, S., Stewart, R. E. A., and Lavigne, D. M. (1981). Growth in Northwest Atlantic harp seals Phoca groenlandica. Journal of zoology, 194:11--24.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [KovaLavi1985] Kovacs, K. M. and Lavigne, D. (1985). Neonatal growth of and organ allometry of Northwest Atlantic harp seals, Pagophilus groenlandicus. Canadian Journal of Zoology, 63:2793--2799.
• [KovaLavi1986] Kovacs, K. M. and Lavigne, D. M. (1986). Maternal investment and neonatal growth in phocid seals. Journal of Animal Ecology, 55:1035--1051.
• [MillBurt2001] Miller, E. H. and Burton, L. E. (2001). It's all relative: allometry and variation in the baculum of the harp seal, Pagophilus groenlandicus. Journal of Mammology, 72:345--355.