Gregory, P. J. (2006). Plant roots: Growth, activity, and interaction with soils. Oxford: Blackwell Pub..
Dyfyniad Arddull ChicagoGregory, Peter J. Plant Roots: Growth, Activity, and Interaction With Soils. Oxford: Blackwell Pub., 2006.
Dyfyniad MLAGregory, Peter J. Plant Roots: Growth, Activity, and Interaction With Soils. Oxford: Blackwell Pub., 2006.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.