: "The Study of Spirituality", Oxford University Press, 1986, ISBN 0-19-504170-4* Bernard McGinn: "The Foundations of Mysticism: Origins to the Fifth Century", 1991, reprint 1994, ISBN 0-8245-1404-1* Bernard McGinn: "The Growth of Mysticism: Gregory the Great through the 12th Century", 1994, paperback ed.
* : "The Foundations of Mysticism: Origins to the Fifth Century", 1991, reprint 1994, ISBN 0-8245-1404-1* : "The Growth of Mysticism: Gregory the Great through the 12th Century", 1994, paperback ed.