хThe иNational Association of Social Workers, Karls, J. M., & Wandrei, K. E. (1994). Person in environment system: The PIE classification system for social functioning problems. The National Association of Social Workers.
Chicago Style (17th ed.) CitationхThe иNational Association of Social Workers, James M. Karls, and Karin E. Wandrei. Person in Environment System: The PIE Classification System for Social Functioning Problems. Washington: The National Association of Social Workers, 1994.
MLA (8th ed.) CitationхThe иNational Association of Social Workers, et al. Person in Environment System: The PIE Classification System for Social Functioning Problems. The National Association of Social Workers, 1994.
Warning: These citations may not always be 100% accurate.
