Egan, G. (2010). The skilled helper: A problem-management and opportunity-development approach to helping (9th ed.). Brooks/Cole.
Chicago-Zitierstil (17. Ausg.)Egan, Gerard. The Skilled Helper: A Problem-management and Opportunity-development Approach to Helping. 9th ed. Australia: Brooks/Cole, 2010.
MLA-Zitierstil (9. Ausg.)Egan, Gerard. The Skilled Helper: A Problem-management and Opportunity-development Approach to Helping. 9th ed. Brooks/Cole, 2010.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.