1. The organic codes. The basic mechanism of macroevolution;Barbieri;Riv. Biologia–Biology Forum,1998
2. The Organic Codes. An Introduction to Semantic Biology;Barbieri,2003
3. Introduction to Biosemiotics: the New Biological Synthesis;Barbieri,2007
4. Is the cell a semiotic system?;Barbieri,2009
5. Origin and evolution of the brain;Barbieri;Biosemiotics,2011