(2007). Forage: The scence of grassland agriculture. Ames: Iowa State Press.
Dyfyniad Arddull ChicagoForage: The Scence of Grassland Agriculture. Ames: Iowa State Press, 2007.
Dyfyniad MLAForage: The Scence of Grassland Agriculture. Ames: Iowa State Press, 2007.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.