APA (7th ed.) Zitazioa
Egan, G. The Skilled Helper: A Problem-Management and Opportunity-Development Approach to Helping (10a edición.). Brooks Cole.
Chicago Style (17th ed.) Zitazioa
Egan, Gerard. The Skilled Helper: A Problem-Management and Opportunity-Development Approach to Helping. 10a edición. Belmont, EUA: Brooks Cole.
MLA (9th ed.) Zitazioa
Egan, Gerard. The Skilled Helper: A Problem-Management and Opportunity-Development Approach to Helping. 10a edición. Brooks Cole.
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