Contemporary debates in metaphysics / edited by Theodore Sider, John Hawthorne and Dean W. Zimmerman. - Sider, Theodore. (OLS)http://pul/name/71972; Hawthorne, John. (OLS)http://pul/name/55679; Zimmerman, Dean W. (OLS)http://pul/name/54284 (Blackwell Publishing, 2008)
Bibliografia in nota.

Descolarizzare la società / Ivan Illich ; prefazione di Hartmut von Hentig. - Illich, Ivan, 1926-2002. (OLS)http://pul/name/40870; Hentig, Hartmut von. (OLS)http://pul/name/48138 (Mondadori, 1973)