Redigerer Spurvefugler (avsnitt)

== Referanser ==
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<ref name="Baker mfl">A.J.Baker, S.L.Pereira, O.P.Haddrath and K.A.Edge. 2006. [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1560011/ Multiple gene evidence for expansion of extant penguins out of Antarctica due to global cooling]. ''Proc Biol Sci''. vol. '''273''', issue 1582, pp. 11–17</ref>

<ref name="del Hoyo & Collar (2016)">Josep del Hoyo, Nigel J. Collar. ''HBW and BirdLife International Illustrated Checklist of the Birds of the World''. '''Volume 2''' - ''Passerines'', publisert i [[desember]] [[2016]]. ID:ILCHK02 ISBN 978-84-96553-98-9</ref>

<ref name="Edwards&Harshman2003">Edwards, Scott V. and John Harshman. 2013. [http://tolweb.org/Passeriformes/15868/2013.02.06 Passeriformes. Perching Birds, Passerine Birds]. Version 06 February 2013</ref>

<ref name="Jarvis2014">{{Cite journal|last1=Jarvis|first1=E. D.|last2=Mirarab|first2=S.|last3=Aberer|first3=A. J.|last4=''et al.''|title=Whole-genome analyses resolve early branches in the tree of life of modern birds|journal=Science|date=2014|volume=346|issue=6215|pages=1320–1331|doi=10.1126/science.1253451|url=http://www.sciencemag.org/content/346/6215/1320.abstract}}</ref>

<ref name="Payevsky2013">V. A. Payevsky. 2014-04-26. [http://dx.doi.org/10.1134/S2079086414020054 Phylogeny and classification of passerine birds, passeriformes]. ''Biology Bulletin Reviews''. Volume '''4''', Issue 2, pp 143-156</ref>

<ref name="Slack">Slack, K.E., Jones, C.M., Ando, T., Harrison G.L., Fordyce R.E., Arnason, U. and Penny, D. (2006). "Early Penguin Fossils, plus Mitochondrial Genomes, Calibrate Avian Evolution." Molecular Biology and Evolution, 23(6): 1144-1155. {{DOI|10.1093/molbev/msj124}} [http://mbe.oxfordjournals.org/cgi/reprint/23/6/1144 PDF fulltext] [http://mbe.oxfordjournals.org/cgi/content/full/msj124/DC1 Supplementary Material]. Besøkt 2012-08-03</ref>
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