World Health Organisation. (1989). Health of the elderly World Health organisation. World Health Organisation.
Chicago Edition CitationWorld Health Organisation. Health of the Elderly World Health Organisation. Geneva: World Health Organisation, 1989.
ציטוט MLAWorld Health Organisation. Health of the Elderly World Health Organisation. World Health Organisation, 1989.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.