Nicholls, Y. I. (1973). Source book: Emergence of proposals for recompensing developing countries for maintaining environmental quality. International Union for Conservation of Nature and Natural Resources.
Lua i Stíl Chicago (17ú heag.)Nicholls, Yvonne I. Source Book: Emergence of Proposals for Recompensing Developing Countries for Maintaining Environmental Quality. Switzerland: International Union for Conservation of Nature and Natural Resources, 1973.
Lua MLA (9ú heag.)Nicholls, Yvonne I. Source Book: Emergence of Proposals for Recompensing Developing Countries for Maintaining Environmental Quality. International Union for Conservation of Nature and Natural Resources, 1973.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.