Dyfyniad APA

OMS. (2001). Environmental health criteria; N.221: Zinc. Geneva: OMS.

Dyfyniad Arddull Chicago

OMS. Environmental Health Criteria; N.221: Zinc. Geneva: OMS, 2001.

Dyfyniad MLA

OMS. Environmental Health Criteria; N.221: Zinc. Geneva: OMS, 2001.

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