Warheit, G. J., Bell, R. A., & Schwab, J. J. Planning for change: Needs assessment approaches. s.n.
Cita Chicago (17th ed.)Warheit, George J., Roger A. Bell, i John J. Schwab. Planning for Change: Needs Assessment Approaches. [S.l: s.n.
Cita MLA (9th ed.)Warheit, George J., et al. Planning for Change: Needs Assessment Approaches. s.n.
Atenció: Aquestes cites poden no estar 100% correctes.