American Evaluation Association, Task Force on Guiding Principles for Evaluators. (1995). Guiding principles for evaluators. In W. R. Shadish, D. L. Newman, M. A. Scheirer, & C. Wye (Eds.), Guiding principles for evaluators. New Directions for Program Evaluation, 66, 19-26. San Francisco: Jossey-Bass.
2.
Joint Committee on Standards for Educational Evaluation. (1994). The program evaluation standards (2nd ed.). Thousand Oaks, CA: Sage.
3.
Posavac, E. J., & Carey, R. G. (1997). Program evaluation: Methods and case studies (5th ed.). Upper Saddle River, NJ: Prentice Hall.
