Casey, M. (1994). The undivided heart: The western monastic approach to contemplation. St. Bede's Publications.
Lua i Stíl Chicago (17ú heag.)Casey, Michael. The Undivided Heart: The Western Monastic Approach to Contemplation. Petersham, Mass.: St. Bede's Publications, 1994.
Lua MLA (8ú heag.)Casey, Michael. The Undivided Heart: The Western Monastic Approach to Contemplation. St. Bede's Publications, 1994.
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