National Association of Social Workers., Karls, J. M., & Wandrei, K. E. (1994). Person-in-environment system: The PIE classification system for social functioning problems. Washington, DC: NASW Press, National Association of Social Workers.
Chicago Style CitationNational Association of Social Workers., James M. Karls, and Karin Evon Wandrei. Person-in-environment System: The PIE Classification System for Social Functioning Problems. Washington, DC: NASW Press, National Association of Social Workers, 1994.
MLA CitationNational Association of Social Workers., James M. Karls, and Karin Evon Wandrei. Person-in-environment System: The PIE Classification System for Social Functioning Problems. Washington, DC: NASW Press, National Association of Social Workers, 1994.