Walker, E., Elsworth, S., & Lê Thành Tâm. (2004). New grammar practice for pre-intermediate students. Tp. Hồ Chí Minh: Trẻ.
Dyfyniad Arddull ChicagoWalker, Elaine, Steve Elsworth, và Lê Thành Tâm. New Grammar Practice for Pre-intermediate Students. Tp. Hồ Chí Minh: Trẻ, 2004.
Dyfyniad MLAWalker, Elaine, Steve Elsworth, và Lê Thành Tâm. New Grammar Practice for Pre-intermediate Students. Tp. Hồ Chí Minh: Trẻ, 2004.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.