Weiss, C. H. (1972). Evaluation research: Methods for assessing program effectiveness. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Weiss, Carol H. Evaluation Research: Methods for Assessing Program Effectiveness. Englewood Cliffs, NJ: Prentice-Hall, 1972.
Lua MLA (9ú heag.)Weiss, Carol H. Evaluation Research: Methods for Assessing Program Effectiveness. Prentice-Hall, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.