Não informado. (1978). Evaluation and Program Planning. Pergamon Press.
Lua i Stíl Chicago (17ú heag.)Não informado. Evaluation and Program Planning. New York: Pergamon Press, 1978.
Lua MLA (8ú heag.)Não informado. Evaluation and Program Planning. Pergamon Press, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.