Egan, G. (1990). The skilled helper: A systematic approach to effective helping (4th ed.). Brooks/Cole Publishing Comp.
Chicago-Zitierstil (17. Ausg.)Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 4th ed. Pacific Grove, California: Brooks/Cole Publishing Comp, 1990.
MLA-Zitierstil (9. Ausg.)Egan, Gerard. The Skilled Helper: A Systematic Approach to Effective Helping. 4th ed. Brooks/Cole Publishing Comp, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.