Yules, G. (1997). Study of Language (2nd.). Cambridge University Press.
Dyfyniad Arddull ChicagoYules, Geroge. Study of Language. 2nd. Cambridge: Cambridge University Press, 1997.
Dyfyniad MLAYules, Geroge. Study of Language. 2nd. Cambridge University Press, 1997.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.