- Gregorianische Gesänge, Pfingsten, Eucharistie, Maria = [Pentecost, Eucharist, St. Mary]
- The divine office, the liturgy of the hours according to the Roman rite, revised by decree of the Second Vatican Ecumenical Council and published by authority of Pope Paul VI
- Gregorian chant, the ecclesiastical year in Gregorian chant
- Daily missal of the Mystical Body., Edited by the Maryknoll Fathers with collaboration of Charles J. Callan
- Compendium, Catechism of the Catholic Church
- Gregorian chant, Gregorianischer Choral = Chant grégorien
- Catechism of the Catholic Church
- Chant