Van der Ploeg, R., & Withagen, C. (2010). Is there really a green paradox? University of Oxford.
Lua i Stíl Chicago (17ú heag.)Van der Ploeg, R., agus C. Withagen. Is There Really a Green Paradox? University of Oxford, 2010.
Lua MLA (9ú heag.)Van der Ploeg, R., agus C. Withagen. Is There Really a Green Paradox? University of Oxford, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.