Não informado. (1990). Research Journal of the Water Pollution Control Federation. Water Pollution Control Federation.
Lua i Stíl Chicago (17ú heag.)Não informado. Research Journal of the Water Pollution Control Federation. Alexandria, Va: Water Pollution Control Federation, 1990.
Lua MLA (8ú heag.)Não informado. Research Journal of the Water Pollution Control Federation. Water Pollution Control Federation, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.