Geahča maid: Unfolding the mystery :
- The end of the present world and the mysteries of the future life.
- Monastic spirituality.
- Handbook for liturgical studies.
- The organic development of the liturgy : the principles of liturgical reform and their relation to the twentieth century liturgical movement prior to the Second Vatican Council.
- The Liturgical experience: beauty and transcendence.
- Monastic life at Cluny 910-1157.