1. Amundson R (1994) Two concepts of constraint: adaptationism and the challenge from developmental biology. Philos Sci 61:556–578
2. Beatty J (1995) The evolutionary contingency thesis. In: Wolters G, Lennox J (eds) Concepts, theories, and rationality in the biological sciences. University of Pittsburgh Press, Pennsylvania
3. Brandon RN (1990) Adaptation and environment. Princeton University Press, Princeton
4. Carroll SB (2005) Endless forms most beautiful: the new science of evo devo. W.W. Norton, New York
5. Conway Morris S (1998) The crucible of creation: the burgess shale and the rise of animals. Oxford University Press, Oxford