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Dyfyniad Arddull Chicago, Factors of soil formation. Factors of Soil Formation#A Fiftieth Anniversary Restrospective#Edited by Ronald Amudson. Soil Science Society of America Inc.
Dyfyniad MLA, Factors of soil formation. Factors of Soil Formation#A Fiftieth Anniversary Restrospective#Edited by Ronald Amudson. Soil Science Society of America Inc.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.