Walker, E., Elsworth, S., & Nguyễn Văn Phước. (2001). Grammar practice for upper intermediate students (New ed.). Tp.HCM: Nxb Trẻ.
Chicago-стиль цитированияWalker, Elaine., Steve Elsworth, và Nguyễn Văn Phước. Grammar Practice for Upper Intermediate Students. New ed. Tp.HCM: Nxb Trẻ, 2001.
MLA-цитированиеWalker, Elaine., Steve Elsworth, và Nguyễn Văn Phước. Grammar Practice for Upper Intermediate Students. New ed. Tp.HCM: Nxb Trẻ, 2001.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.