Paul VI, P. (1966). On liturgy in choir duty: Letter of Pope Paul VI to superiors general of clerical religious institutes bound by the obligation of choir duty. National Catholic Welfare Conference.
Chicago Style (17. basım) AtıfPaul VI, Pope. On Liturgy in Choir Duty: Letter of Pope Paul VI to Superiors General of Clerical Religious Institutes Bound by the Obligation of Choir Duty. Washington, D.C.: National Catholic Welfare Conference, 1966.
MLA (8th ed.) AtıfPaul VI, Pope. On Liturgy in Choir Duty: Letter of Pope Paul VI to Superiors General of Clerical Religious Institutes Bound by the Obligation of Choir Duty. National Catholic Welfare Conference, 1966.
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