APA (7th ed.) Zitazioa
Perkinson, R. R. (1997). Chemical dependency counseling: A pratical guide. Sage.
Chicago Style (17th ed.) Zitazioa
Perkinson, Robert R. Chemical Dependency Counseling: A Pratical Guide. California: Sage, 1997.
MLA (9th ed.) Zitazioa
Perkinson, Robert R. Chemical Dependency Counseling: A Pratical Guide. Sage, 1997.
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