Dyfyniad APA

(2001). WHO drug ninformation, Vol.15.No.3&4,2001. World Health Organisation.

Dyfyniad Arddull Chicago

WHO Drug Ninformation, Vol.15.No.3&4,2001. Geneva: World Health Organisation, 2001.

Dyfyniad MLA

WHO Drug Ninformation, Vol.15.No.3&4,2001. World Health Organisation, 2001.

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