Dyfyniad APA

Lal, R., & Shukla, M. K. (2004). Principles of soil physics. Marcel Dekker.

Dyfyniad Arddull Chicago

Lal, Rattan, and Manoj K. Shukla. Principles of Soil Physics. New York: Marcel Dekker, 2004.

Dyfyniad MLA

Lal, Rattan, and Manoj K. Shukla. Principles of Soil Physics. Marcel Dekker, 2004.

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