Lawrence, D. P. (2013). Impact assessment: Practical solutions to recurrent problems and contemporary challenges (2nd ed.). John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Lawrence, David P. Impact Assessment: Practical Solutions to Recurrent Problems and Contemporary Challenges. 2nd ed. Hoboken, N.J.: John Wiley & Sons, 2013.
Lua MLA (9ú heag.)Lawrence, David P. Impact Assessment: Practical Solutions to Recurrent Problems and Contemporary Challenges. 2nd ed. John Wiley & Sons, 2013.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.