World Health Organization. (1991). Environmental health criteria 148. World Health Organization.
Chicago-referens (17:e uppl.)World Health Organization. Environmental Health Criteria 148. Geneva: World Health Organization, 1991.
MLA-referens (8:e uppl.)World Health Organization. Environmental Health Criteria 148. World Health Organization, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.