International Plant Genetic resources institute. (2001). IPGRI thematic report 2000-2001.
Dyfyniad Arddull ChicagoInternational Plant Genetic resources institute. IPGRI Thematic Report 2000-2001. 2001.
Dyfyniad MLAInternational Plant Genetic resources institute. IPGRI Thematic Report 2000-2001. 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.