Nachmias, D. (1980). The Practice of policy evaluation. St. Martin's Press.
Lua i Stíl Chicago (17ú heag.)Nachmias, David. The Practice of Policy Evaluation. New York: St. Martin's Press, 1980.
Lua MLA (9ú heag.)Nachmias, David. The Practice of Policy Evaluation. St. Martin's Press, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.