1. Born Free;Adamson,1960
2. The Elephant Whisperer: Learning about Life, Loyalty, and Freedom from a Remarkable Herd of Elephants;Anthony,2010
3. Catastrophe Theory;Arnold,1992
4. In the Theatre of Consciousness: the Workspace of the Mind;Baars,1997
5. How Nature Works – the Science of Self-organized Criticality;Bak,1996