Dyfyniad APA

World Health Organization. (1991). Environmental health criteria 148. World Health Organization.

Dyfyniad Arddull Chicago

World Health Organization. Environmental Health Criteria 148. Geneva: World Health Organization, 1991.

Dyfyniad MLA

World Health Organization. Environmental Health Criteria 148. World Health Organization, 1991.

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