ಆರ್ಕಿಯಾಪ್ಟೆರಿಕ್ಸ್: ಪರಿಷ್ಕರಣೆಗಳ ನಡುವಿನ ವ್ಯತ್ಯಾಸ

* [http://www.ucmp.berkeley.edu/diapsids/birds/archaeopteryx.html ''Archaeopteryx'': An Early Bird] — University of California Museum of Paleontology.

* [http://www.ucmp.berkeley.edu/diapsids/avians.html Are Birds Really Dinosaurs?] — University of California Museum of Paleontology.