1. Anderson, M., Deely, J., Krampen, M., Ransdell, J., Sebeok, T. A., & von Uexküll, T. (1984). A semiotic perspective on the sciences: steps toward a new paradigm. Semiotica, 52(1/2), 7–47.
2. Arnellos, A., Bruni, L. E., El-Hani, C. N., & Collier, J. (2012). Anticipatory functions, digital-analog forms and biosemiotics. Biosemiotics (in press).
3. Augustine of Hippo (389ad) De Doctrina Christiana. In: W. M. Green (ed) Sancti Augustini Opera, 1963, CSEL 80, Vienna.
4. Barbieri, M. (2003). The organic codes. An introduction to semantic biology. Cambridge: Cambridge University Press.
5. Barbieri, M. (2006). Semantic biology and the mind-body problem: the theory of the conventional mind. Biological Theory, 1(4), 352–356.