Não informado. (1991). International Journal of Environment and Pollution. Inderscience Enterprises.
Chicago-referens (17:e uppl.)Não informado. International Journal of Environment and Pollution. Geneva, Suíça: Inderscience Enterprises, 1991.
MLA-referens (8:e uppl.)Não informado. International Journal of Environment and Pollution. Inderscience Enterprises, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.