Röbbelen, G. (1989). Oil crops of the world: Their breeding and utilization. New York: McGraw-Hill.
Dyfyniad Arddull ChicagoRöbbelen, Gerhard. Oil Crops of the World: Their Breeding and Utilization. New York: McGraw-Hill, 1989.
Dyfyniad MLARöbbelen, Gerhard. Oil Crops of the World: Their Breeding and Utilization. New York: McGraw-Hill, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.