Catholic Church. Pope (1963-1978 : Paul VI) & Baum, G. (1964). Encyclical letter of His Holiness Pope Paul VI: The paths of the church. Paulist Press.
Chicago-referens (17:e uppl.)Catholic Church. Pope (1963-1978 : Paul VI) och Gregory Baum. Encyclical Letter of His Holiness Pope Paul VI: The Paths of the Church. Glen Rock, N.J.: Paulist Press, 1964.
MLA-referens (8:e uppl.)Catholic Church. Pope (1963-1978 : Paul VI) och Gregory Baum. Encyclical Letter of His Holiness Pope Paul VI: The Paths of the Church. Paulist Press, 1964.
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