Butler, J. D. (1951). Four philosophies and their practice in education and religion. Harper.
Lua i Stíl Chicago (17ú heag.)Butler, James Donald. Four Philosophies and Their Practice in Education and Religion. New York: Harper, 1951.
Lua MLA (9ú heag.)Butler, James Donald. Four Philosophies and Their Practice in Education and Religion. Harper, 1951.
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