Não informado. (1986). Air & Water Pollution Control. Bureau of National Affairs.
Lua i Stíl Chicago (17ú heag.)Não informado. Air & Water Pollution Control. Washington: Bureau of National Affairs, 1986.
Lua MLA (8ú heag.)Não informado. Air & Water Pollution Control. Bureau of National Affairs, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.