Não informado. (1991). International Journal of Environment and Pollution. Inderscience Enterprises.
Lua i Stíl Chicago (17ú heag.)Não informado. International Journal of Environment and Pollution. Geneva, Suíça: Inderscience Enterprises, 1991.
Lua MLA (8ú heag.)Não informado. International Journal of Environment and Pollution. Inderscience Enterprises, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.