Canon Law and the Christian Community: the Role of Law in the Church according to the Summa Aurea of Cardinal Hostiensis. By Clarence Gallagher, S.J. (Analecta Gregoriana, vol. ccviii, Sectio A, no. 8). Pp. 242. Roma: Università Gregoriana, 1978. L. 9,000 - Ullmann, Walter (The journal of ecclesiastical history, 1979)