Du Boulay, S. (1998). Beyond the darkness: A biography of Bede Griffiths (1st ed. in the United States of America.). Doubleday.
Chicago-referens (17:e uppl.)Du Boulay, Shirley. Beyond the Darkness: A Biography of Bede Griffiths. 1st ed. in the United States of America. New York: Doubleday, 1998.
MLA-referens (8:e uppl.)Du Boulay, Shirley. Beyond the Darkness: A Biography of Bede Griffiths. 1st ed. in the United States of America. Doubleday, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.