Tài liệu tham khảo WikiPedia: Khủng long chân chim http://dinosauricon.com/taxa/ornithopoda.html http://personal2.stthomas.edu/jstweet/ornithopoda.... http://www.geol.umd.edu/~tholtz/G104/10419orni.htm http://www.geol.umd.edu/~tholtz/dinoappendix/Holtz... //pubmed.ncbi.nlm.nih.gov/19295609 //doi.org/10.1038%2Fnature07856 //doi.org/10.1111%2Fj.1475-4983.2011.01046.x https://web.archive.org/web/20050404084750/http://... https://web.archive.org/web/20060222150033/http://... https://commons.wikimedia.org/wiki/Category:Ornith...
