| title | ISBN-13 (ISBN-10) | year of publication |
|---|---|---|
| El Mayor Signo De Vida/ the Biggest Sign of Life: Una Nueva Filosofia | 978-1-223-05846-7 (1-223-05846-8) | 2005 |
| El Mayor Signo De Vida/ the Biggest Sign of Life: Una Nueva Filosofia | 978-84-609-6906-8 (84-609-6906-1) | 2005 |