Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.