Dyfyniad APA

(2006). Abstracts. 18th World congress of soil science (July 9-15, 2006, Philadelphia).

Dyfyniad Arddull Chicago

Abstracts. 18th World Congress of Soil Science (July 9-15, 2006, Philadelphia). 2006.

Dyfyniad MLA

Abstracts. 18th World Congress of Soil Science (July 9-15, 2006, Philadelphia). 2006.

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