Tripodi, T., Fellin, P., & Epstein, I. (1978). Differential social program evaluation. F. E. Peacock Publishers.
Lua i Stíl Chicago (17ú heag.)Tripodi, Tony, Phillip Fellin, agus Irwin Epstein. Differential Social Program Evaluation. Itasca, Ill.: F. E. Peacock Publishers, 1978.
Lua MLA (8ú heag.)Tripodi, Tony, et al. Differential Social Program Evaluation. F. E. Peacock Publishers, 1978.
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