Dyfyniad APA

Lal, R. (1999). Soil quality and soil erosion. CRC Press.

Dyfyniad Arddull Chicago

Lal, Rattan. Soil Quality and Soil Erosion. Boca Raton: CRC Press, 1999.

Dyfyniad MLA

Lal, Rattan. Soil Quality and Soil Erosion. CRC Press, 1999.

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