Walker, E., Elsworth, S., & Nguyễn Văn Phước. (2003). Grammar practice for intermediate students: With answers (New ed.). Tp.HCM: Nxb Trẻ.
Stile di citazione ChicagoWalker, Elaine., Steve Elsworth, e Nguyễn Văn Phước. Grammar Practice for Intermediate Students: With Answers. New ed. Tp.HCM: Nxb Trẻ, 2003.
Citazione MLAWalker, Elaine., Steve Elsworth, e Nguyễn Văn Phước. Grammar Practice for Intermediate Students: With Answers. New ed. Tp.HCM: Nxb Trẻ, 2003.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.