Ksepka, D. T. B., Sara; Giannini, Norberto P; (2006). „The phylogeny of the living and fossil Sphenisciformes (penguins)”. Cladistics22 (5), 412–441. o. DOI:10.1111/j.1096-0031.2006.00116.x.
(2006) „Multiple gene evidence for expansion of extant penguins out of Antarctica due to global cooling”. Proceedings of the Royal Society B: Biological Sciences273 (1582), 11–7. o. DOI:10.1098/rspb.2005.3260. PMID16519228. PMC1560011.
(2006) „Multiple gene evidence for expansion of extant penguins out of Antarctica due to global cooling”. Proceedings of the Royal Society B: Biological Sciences273 (1582), 11–7. o. DOI:10.1098/rspb.2005.3260. PMID16519228. PMC1560011.
ncbi.nlm.nih.gov
(2006) „Multiple gene evidence for expansion of extant penguins out of Antarctica due to global cooling”. Proceedings of the Royal Society B: Biological Sciences273 (1582), 11–7. o. DOI:10.1098/rspb.2005.3260. PMID16519228. PMC1560011.