Egan, G. (1986). The skilled helper: A systematic approach to effective helping (3rd ed.). Brooks / Cole.
Chicago-viite (17. p.)Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 3rd ed. California: Brooks / Cole, 1986.
MLA-viite (9. p.)Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 3rd ed. Brooks / Cole, 1986.
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