RT Article T1 Friendship and Rivalry: The Role of Amicitia in Twelfth-Century Monastic Relations JF The journal of ecclesiastical history VO 44 IS 3 SP 390 OP 390 A1 Haseldine, Julian LA English PB Cambridge Univ. Press YR 1993 UL https://www.ixtheo.de/Record/1638955662