Hatry, H. P., Newcomer, K. E., & Wholey, J. S. (1994). Handbook of practical program evaluation. Jossey-Bass.
Chicago Style aipamenaHatry, Harry P., Kathryn E. Newcomer, and Joseph S. Wholey. Handbook of Practical Program Evaluation. San Francisco: Jossey-Bass, 1994.
MLA aipamenaHatry, Harry P., et al. Handbook of Practical Program Evaluation. Jossey-Bass, 1994.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.