Não informado. (2004). EDS: Environmental Data Service. Environmental Data Service.
Chicago-referens (17:e uppl.)Não informado. EDS: Environmental Data Service. Washington: Environmental Data Service, 2004.
MLA-referens (8:e uppl.)Não informado. EDS: Environmental Data Service. Environmental Data Service, 2004.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.