Robson, M. S. (2005). Language in theory. Routledge.
Dyfyniad Arddull ChicagoRobson, Mark Stockwell. Language in Theory. USA: Routledge, 2005.
Dyfyniad MLARobson, Mark Stockwell. Language in Theory. Routledge, 2005.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.