Dyfyniad APA

(1990). Transactions: 14th International Congress of Soil Science. Japan: International Society of Soil Science.

Dyfyniad Arddull Chicago

Transactions: 14th International Congress of Soil Science. Japan: International Society of Soil Science, 1990.

Dyfyniad MLA

Transactions: 14th International Congress of Soil Science. Japan: International Society of Soil Science, 1990.

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