1. Bateson, G. (1972). Steps to an Ecology of Mind. New York: Ballantine Books.
2. Bateson, G. (1979). Mind and Nature. A Necessary Unity. New York: Bentam Books.
3. Brier, S. (2000). Biosemiotics as a possible bridge between embodiment in cognitive semantics and the motivation concept of animal cognition in ethology. Cybernetics & Human Knowing 7(1), 57–76.
4. Bruni, L. E. (2002). Does ‘quorum sensing’ imply a new type of biological information. Sign Systems Studies 30(1), 221–243.
5. Bruni, L. E. (2003). A sign-theoretic approach to biotechnology. Dissertation. Copenhagen: Institute of Molecular Biology, University of Copenhagen.