• [Wiki] http://en.wikipedia.org/wiki/Lagopus_muta.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=79B161B7017DD7ED&sec=lifehistory.
• [AnAge] https://genomics.senescence.info/species/entry.php?species=Lagopus_muta.
• [Kooy2010] Kooijman, S. (2010). Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge.
• [PrinPres1991] Prinzinger, R., A.Preßmar, and Schleucher, E. (1991). Body temperature in birds. Comp. Biochem. Physiol., 99A(4):499--506. doi:10.1016/0300-9629(91)90122-S.
• [SteeUnan1985] Steen, J. B. and Unander, S. (1985). Breeding biology of the Svalbard rock ptarmigan Lagopus mutus hyperboreus. Ornis Scandinavica (Scandinavian Journal of Ornithology)}, 16(3):191--197. doi:10.2173/bow.saggro.0.