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