Dyfyniad APA

(1980). Case studies on desertification (Natural Resources Research XVIII). Unesco/UNEP/UNDP.

Dyfyniad Arddull Chicago

Case Studies on Desertification (Natural Resources Research XVIII). Paris: Unesco/UNEP/UNDP, 1980.

Dyfyniad MLA

Case Studies on Desertification (Natural Resources Research XVIII). Unesco/UNEP/UNDP, 1980.

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