Cf. Kelly, op. cit., p. 416; R. F. Evans, One and Holy. The Church in Latin Patristic Thought, S. P. C. K. London, 1972, pp. 100-01; and J. O. Meara, Charter of Christendom. The Significance of the City of God, Macmillan, N. Y. 1961, pp. 52-53.
NB: These notes are also displayed as endnotes at the bottom of every chapter.