Colledge, R. (2002) Mastering counselling theory. New York: Palgrave. Available at: https://ebookcentral.proquest.com/lib/bilibrary/detail.action?pq-origsite=primo&docID=6418945.
Nelson-Jones, R. (2015) Basic counselling skills. 4th edition. Thousand Oaks, CA: SAGE Publications.