Dyfyniad APA

Alcock, B. (1980). The costs of soil erosion (Rev. ed.). Dept. of Primary Industries.

Dyfyniad Arddull Chicago

Alcock, B.S. The Costs of Soil Erosion. Rev. ed. <Toowoomba, Qld.?>: Dept. of Primary Industries, 1980.

Dyfyniad MLA

Alcock, B.S. The Costs of Soil Erosion. Rev. ed. Dept. of Primary Industries, 1980.

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