
- Author: francisco Varela
- Language: English
- Year: 1999

- Author: Humberto Maturana Romesín Francisco Varela
- Language: Portuguese
- Year: 1995

- Author: Niklas Luhmann Humberto R. Maturana Mikio Namiki Volker Redder Francisco Varela
- Language: German
- Year: 2003

- Author: francisco Varela
- Language: English
- Year: 1999

- Author: Humberto Maturana Francisco Varela
- Language: Spanish
- Year: 2003

- Author: francisco Varela
- Language: English
- Year: 1999