Corey, M. S. 1., & Corey, G. (2007). Becoming a helper (5th ed.). Belmont, CA: Thomson Higher Education.
Παραπομπή Chicago StyleCorey, Marianne Schneider 1942-, και Gerald Corey. Becoming a Helper. 5th ed. Belmont, CA: Thomson Higher Education, 2007.
Παραπομπή MLACorey, Marianne Schneider 1942-, και Gerald Corey. Becoming a Helper. 5th ed. Belmont, CA: Thomson Higher Education, 2007.
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