APA (7th ed.) Citation

Karls, J. M., & Wandrei, K. E. (1994). PIE manual: Person-in-environment system. NASW Press, National Association of Social Workers.

Chicago Style (17th ed.) Citation

Karls, James M., and Karin Evon Wandrei. PIE Manual: Person-in-environment System. Washington, D.C: NASW Press, National Association of Social Workers, 1994.

MLA (9th ed.) Citation

Karls, James M., and Karin Evon Wandrei. PIE Manual: Person-in-environment System. NASW Press, National Association of Social Workers, 1994.