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BAKER, Allan J; PEREIRA, Sergio Luiz; HADDRATH, Oliver P. Multiple gene evidence for expansion of extant penguins out of Antarctica due to global cooling. Proceedings of the Royal Society B: Biological Sciences. 2006-01-07, roč. 273, čís. 1582, s. 11–17. PMID: 16519228
PMCID: PMC1560011. Dostupné online [cit. 2018-02-11]. ISSN0962-8452. DOI10.1098/rspb.2005.3260. PMID16519228.