Não informado. (2001). Resources, Conservation and Recycling. Editions Elsevier.
Lua i Stíl Chicago (17ú heag.)Não informado. Resources, Conservation and Recycling. Amsterdam: Editions Elsevier, 2001.
Lua MLA (8ú heag.)Não informado. Resources, Conservation and Recycling. Editions Elsevier, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.