Dyfyniad APA

Country and area. (1980). Sixth Report On The Word. Geneva: World Health Organization.

Dyfyniad Arddull Chicago

Country and area. Sixth Report On The Word. Geneva: World Health Organization, 1980.

Dyfyniad MLA

Country and area. Sixth Report On The Word. Geneva: World Health Organization, 1980.

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