Hatry, H. P., Newcomer, K. E., & Wholey, J. S. (1994). Handbook of practical program evaluation. Jossey-Bass.
Lua i Stíl Chicago (17ú heag.)Hatry, Harry P., Kathryn E. Newcomer, agus Joseph S. Wholey. Handbook of Practical Program Evaluation. San Francisco: Jossey-Bass, 1994.
Lua MLA (9ú heag.)Hatry, Harry P., et al. Handbook of Practical Program Evaluation. Jossey-Bass, 1994.
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