World Health Organization. (2001). Sexually transmitted infections: Briefing kit for teachers. World Health Organization.
Dyfyniad Arddull ChicagoWorld Health Organization. Sexually Transmitted Infections: Briefing Kit for Teachers. Manila, Philippines: World Health Organization, 2001.
Dyfyniad MLAWorld Health Organization. Sexually Transmitted Infections: Briefing Kit for Teachers. World Health Organization, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.