Paul VI, P. (1965). On collegiality: Letter to all bishops, December 18, 1964. National Catholic Welfare Conference.
Chicago-viite (17. p.)Paul VI, Pope. On Collegiality: Letter to All Bishops, December 18, 1964. Washington: National Catholic Welfare Conference, 1965.
MLA-viite (8. p.)Paul VI, Pope. On Collegiality: Letter to All Bishops, December 18, 1964. National Catholic Welfare Conference, 1965.
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