(2008). Toefl IBT activator writing: Advanced. Tp. Hồ Chí Minh: Tổng hợp Tp. Hồ Chí Minh.
Dyfyniad Arddull ChicagoToefl IBT Activator Writing: Advanced. Tp. Hồ Chí Minh: Tổng hợp Tp. Hồ Chí Minh, 2008.
Dyfyniad MLAToefl IBT Activator Writing: Advanced. Tp. Hồ Chí Minh: Tổng hợp Tp. Hồ Chí Minh, 2008.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.