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.
Citação do estilo Chicago (17ª ed.)Paul 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.
Citação MLA (8ª ed.)Paul 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.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.