1. Mary Eugenia Laker SSND (1977). Spiritual Friendship, Cistercian Publications.
2. Developing Group-Deliberative Virtues;Aikin;Journal of Applied Philosophy,2010
3. Anglican-Roman Catholic International Commission (2018). Walking Together on the Way: Learning to be the Church-Local, Regional, Universal, SPCK.
4. Freese, John Henry (1976). Art of Rhetoric, Harvard University Press.
5. Thomson, James Alexander Ker (1979). Ethics, Penguin.