Não informado. (1967). Water Pollution Control. Institute of Water Pollution Control.
Lua i Stíl Chicago (17ú heag.)Não informado. Water Pollution Control. London: Institute of Water Pollution Control, 1967.
Lua MLA (8ú heag.)Não informado. Water Pollution Control. Institute of Water Pollution Control, 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.