Walker, E., Elsworth, S., & Nguyễn Văn Phước. (2001). Grammar practice for upper intermediate students (New ed.). Tp.HCM: Nxb Trẻ.
Styl cytowania ChicagoWalker, Elaine., Steve Elsworth, i Nguyễn Văn Phước. Grammar Practice for Upper Intermediate Students. New ed. Tp.HCM: Nxb Trẻ, 2001.
Styl cytowania MLAWalker, Elaine., Steve Elsworth, i Nguyễn Văn Phước. Grammar Practice for Upper Intermediate Students. New ed. Tp.HCM: Nxb Trẻ, 2001.
Uwaga: Te cytaty mogą odróżniać się od wytycznej twojego fakultetu..