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Bakker, R.T. (1986) The Dinosaur Heresies. Citadel Press Books
Benton, M.J. (2000). Vertebrate Palaeontology. (2nd edition) Blackwell Science Ltd.
Hallam and Wignall (1997) Mass extinctions and their aftermath. Oxford University Press.
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Norman, D. (1994) Prehistoric Life: The rise of Vertebrates. Boxtree Ltd.
Natural History Museum : http://www.nhm.ac.uk
Palaeos: The trace of Life on Earth: http://www.palaeos.com
Dinobase: http://palaeo.gly.bris.ac.uk/dinobase/dinopage.html