Dyfyniad APA

American Society of Agronomy. Journal of environmental quality.

Dyfyniad Arddull Chicago

American Society of Agronomy. Journal of Environmental Quality.

Dyfyniad MLA

American Society of Agronomy. Journal of Environmental Quality.

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