Egan, G. (1990). Exercises in helping skills: A training manual to accompany the skilled helper (4th ed.). Brooks/Cole.
Chicago-Zitierstil (17. Ausg.)Egan, Gerard. Exercises in Helping Skills: A Training Manual to Accompany the Skilled Helper. 4th ed. Monterey: Brooks/Cole, 1990.
MLA-Zitierstil (9. Ausg.)Egan, Gerard. Exercises in Helping Skills: A Training Manual to Accompany the Skilled Helper. 4th ed. Brooks/Cole, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.