Hoffman, Paul (1998). The man who loved only numbers : the story of Paul Erdos and the search for mathematical truth (1st ed.). New York: Hyperion. ISBN0-7868-6362-5. OCLC38557306
Hoffman, Paul (1998). The man who loved only numbers : the story of Paul Erdos and the search for mathematical truth (1st ed.). New York: Hyperion. ISBN0-7868-6362-5. OCLC38557306