एपीए उद्धरण

World Health Organisation. (1989). Health of the elderly World Health organisation. World Health Organisation.

शिकागो स्टाइल उद्धरण

World Health Organisation. Health of the Elderly World Health Organisation. Geneva: World Health Organisation, 1989.

एमएलए उद्धरण

World Health Organisation. Health of the Elderly World Health Organisation. World Health Organisation, 1989.