O'Riordan, T., & Sewell, W. R. D. (1981). Project appraisal and policy review. John Wiley.
Lua i Stíl Chicago (17ú heag.)O'Riordan, Timothy, agus W. R. Derrick Sewell. Project Appraisal and Policy Review. Chichester: John Wiley, 1981.
Lua MLA (9ú heag.)O'Riordan, Timothy, agus W. R. Derrick Sewell. Project Appraisal and Policy Review. John Wiley, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.