van Nieuwerburgh, C. (2020). An introduction to coaching skills: A practical guide. SAGE Publishing.
Chicago-viite (17. p.)van Nieuwerburgh, Christian. An Introduction to Coaching Skills: A Practical Guide. Thousand Oaks: SAGE Publishing, 2020.
MLA-viite (9. p.)van Nieuwerburgh, Christian. An Introduction to Coaching Skills: A Practical Guide. SAGE Publishing, 2020.
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