Butler, J. D. (1951). Four philosophies and their practice in education and religion. Harper.
Chicago-referens (17:e uppl.)Butler, James Donald. Four Philosophies and Their Practice in Education and Religion. New York: Harper, 1951.
MLA-referens (9:e uppl.)Butler, James Donald. Four Philosophies and Their Practice in Education and Religion. Harper, 1951.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.