Não informado. (2001). Environmental Education Research. Carfax Publishing.
Lua i Stíl Chicago (17ú heag.)Não informado. Environmental Education Research. Abingdon, Inglaterra: Carfax Publishing, 2001.
Lua MLA (8ú heag.)Não informado. Environmental Education Research. Carfax Publishing, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.