APA
Review Group Meeting on Inorganics (2nd : 1991 : Brussels), . (1991). Revision of the WHO guidelines for drinking-water quality : report of the Second Review Group Meeting on Inorganics, Brussels, Belgium, 14-18 October 1991. Geneva: World Health Organization.
Chicago
Review Group Meeting on Inorganics (2nd : 1991 : Brussels), . 1991. Revision of the WHO guidelines for drinking-water quality : report of the Second Review Group Meeting on Inorganics, Brussels, Belgium, 14-18 October 1991. Geneva: World Health Organization.
Harvard
Review Group Meeting on Inorganics (2nd : 1991 : Brussels), . (1991). Revision of the WHO guidelines for drinking-water quality : report of the Second Review Group Meeting on Inorganics, Brussels, Belgium, 14-18 October 1991. Geneva: World Health Organization.
MLA
Review Group Meeting on Inorganics (2nd : 1991 : Brussels), . Revision of the WHO guidelines for drinking-water quality : report of the Second Review Group Meeting on Inorganics, Brussels, Belgium, 14-18 October 1991. Geneva: World Health Organization. 1991.