Christensen P, Bonde N. (2004). Body plumage in Archaeopteryx: a review, and new evidence from the Berlin specimen. Comptes Rendus Palevol. 3: 99–118. PDF fulltext
Clarke, Julia. A.; Norell, Mark. A. (2002). ”The Morphology and Phylogenetic Position of Apsaravis ukhaana from the Late Cretaceous of Mongolia”. American Museum Novitates 3387 (1): sid. 1–46. doi:10.1206/0003-0082(2002)387<0001:TMAPPO>2.0.CO;2.
Lowe, P. R. (1935). ”On the relationship of the Struthiones to the dinosaurs and to the rest of the avian class, with special reference to the position of Archaeopteryx”. Ibis 5 (2): sid. 398–432. doi:10.1111/j.1474-919X.1935.tb02979.x.
Thulborn, R. A. (1984). ”The avian relationships of Archaeopteryx, and the origin of birds”. Zoological Journal of the Linnean Society 82 (1-2): sid. 119–158. doi:10.1111/j.1096-3642.1984.tb00539.x.
Senter, P. (2006). Scapular orientation in theropods and basal birds and the origin of flapping flight. Acta Palaeontologica Polonica. 51(2): 305–313. PDF fulltextArkiverad 14 april 2008 hämtat från the Wayback Machine.
Senter, P. (2006). Scapular orientation in theropods and basal birds and the origin of flapping flight. Acta Palaeontologica Polonica. 51(2): 305–313. PDF fulltextArkiverad 14 april 2008 hämtat från the Wayback Machine.
Johansson, Roland (2011) Urfågeln inte en fågel Göteborgsposten 27 juli 2011 [1]Arkiverad 27 augusti 2011 hämtat från the Wayback Machine.
worldcat.org
Kurzanov, S. M. (1987). ”Avimimidae and the problem of the origin of birds”. Transactions of the joint Soviet-Mongolian Paleontological Expedition 31: sid. 31–94. ISSN0320-2305.
Barsbold, Rhinchen (1983). ”Carnivorous dinosaurs from the Cretaceous of Mongolia”. Transactions of the joint Soviet-Mongolian Paleontological Expedition 19: sid. 5–119. ISSN0320-2305.
Zweers, G. A.; Van den Berge, J.C. (1997). ”Evolutionary patterns of avian trophic diversification”. Zoology: Analysis of Complex Systems 100: sid. 25–57. ISSN0944-2006.