Roggen, H. (1970). Spirit and life: The Gospel way of life in the writings of St. Francis and St. Clare. Franciscan Herald Press.
Chicago-viite (17. p.)Roggen, Heribert. Spirit and Life: The Gospel Way of Life in the Writings of St. Francis and St. Clare. Chicago, Ill.: Franciscan Herald Press, 1970.
MLA-viite (8. p.)Roggen, Heribert. Spirit and Life: The Gospel Way of Life in the Writings of St. Francis and St. Clare. Franciscan Herald Press, 1970.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.