Casey, M. (1994). The undivided heart: The western monastic approach to contemplation. St. Bede's Publications.
Chicago-referens (17:e uppl.)Casey, Michael. The Undivided Heart: The Western Monastic Approach to Contemplation. Petersham, Mass.: St. Bede's Publications, 1994.
MLA-referens (8:e uppl.)Casey, Michael. The Undivided Heart: The Western Monastic Approach to Contemplation. St. Bede's Publications, 1994.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.