Dyfyniad APA

Jan Verhagen. (1997). Spatial soil variability as a guiding principle in nitrogen management. The Netherland: Wageningen University.

Dyfyniad Arddull Chicago

Jan Verhagen. Spatial Soil Variability As a Guiding Principle in Nitrogen Management. The Netherland: Wageningen University, 1997.

Dyfyniad MLA

Jan Verhagen. Spatial Soil Variability As a Guiding Principle in Nitrogen Management. The Netherland: Wageningen University, 1997.

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