B D Graver. (1999). Avanced English practice. Tp. HCM: Thanh Niên.
Dyfyniad Arddull ChicagoB D Graver. Avanced English Practice. Tp. HCM: Thanh Niên, 1999.
Dyfyniad MLAB D Graver. Avanced English Practice. Tp. HCM: Thanh Niên, 1999.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.