Rossi, P. H., & Freeman, H. E. (1993). Evaluation: A systematic approach (Fifth edition.). SAGE Publications.
Lua i Stíl Chicago (17ú heag.)Rossi, Peter H., agus Howard E. Freeman. Evaluation: A Systematic Approach. Fifth edition. California: SAGE Publications, 1993.
Lua MLA (8ú heag.)Rossi, Peter H., agus Howard E. Freeman. Evaluation: A Systematic Approach. Fifth edition. SAGE Publications, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.