World Health Organization. (1984). Guide Lines for Dringking - Water Quality. World Health Organisation.
Chicago-стиль цитированияWorld Health Organization. Guide Lines for Dringking - Water Quality. Geneva: World Health Organisation, 1984.
MLA-цитированиеWorld Health Organization. Guide Lines for Dringking - Water Quality. World Health Organisation, 1984.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.