Dyfyniad APA

(1996). Soil organic matter: Analysis and interpretation. Wisconsin, USA: Soil Science Society of America.

Dyfyniad Arddull Chicago

Soil Organic Matter: Analysis and Interpretation. Wisconsin, USA: Soil Science Society of America, 1996.

Dyfyniad MLA

Soil Organic Matter: Analysis and Interpretation. Wisconsin, USA: Soil Science Society of America, 1996.

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