Dyfyniad APA

Morgan, R. P. C. (1998). Soil erosion and conservation. (2nd ed.). Longman.

Dyfyniad Arddull Chicago

Morgan, R.P.C(Royston Philip Charles). Soil Erosion and Conservation. 2nd ed. Essex: Longman, 1998.

Dyfyniad MLA

Morgan, R.P.C(Royston Philip Charles). Soil Erosion and Conservation. 2nd ed. Longman, 1998.

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