World Health Organisation. (1989). Health of the elderly World Health organisation. World Health Organisation.
Chicago-стиль цитированияWorld Health Organisation. Health of the Elderly World Health Organisation. Geneva: World Health Organisation, 1989.
MLA-цитированиеWorld Health Organisation. Health of the Elderly World Health Organisation. World Health Organisation, 1989.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.