Blewitt, J. Understanding sustainable development (Third edition.).
Lua i Stíl Chicago (17ú heag.)Blewitt, John. Understanding Sustainable Development. Third edition.
Lua MLA (9ú heag.)Blewitt, John. Understanding Sustainable Development. Third edition.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.