Egan, G. (1986). The skilled helper: A systematic approach to effective helping (3rd ed.). Brooks / Cole.
Cita Chicago (17th ed.)Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 3rd ed. California: Brooks / Cole, 1986.
Cita MLA (9th ed.)Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 3rd ed. Brooks / Cole, 1986.
Atenció: Aquestes cites poden no estar 100% correctes.