Dyfyniad APA

Lal R, Blum W H, Valentine C, & Stewart B A. (2014). Methods for assessment of soil degradation. CRC Press.

Dyfyniad Arddull Chicago

Lal R, Blum W H, Valentine C, and Stewart B A. Methods for Assessment of Soil Degradation. New York: CRC Press, 2014.

Dyfyniad MLA

Lal R, et al. Methods for Assessment of Soil Degradation. CRC Press, 2014.

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