1. Agamben, G. (2004). The open: Man and animal. Stanford: Stanford University Press.
2. Althusser, L. (1969) For Marx, (trans: Brewster, B.). London: New Left Books.
3. Barbieri, M. (2002). Has biosemiotics come of age? Semiotica, 139(1/4), 283–295.
4. Barbieri, M. (Ed.). (2002). The organic codes: An introduction to semantic biology. Cambridge: Cambridge University Press.
5. Barbieri, M. (Ed.). (2007a). Introduction to biosemiotics: The new biological synthesis. Dordrecht: Springer.