Eric van Bemmel. (1998). IELTS to success. Tp. HCM: Trẻ.
Chicago Style aipamenaEric van Bemmel. IELTS to Success. Tp. HCM: Trẻ, 1998.
MLA aipamenaEric van Bemmel. IELTS to Success. Tp. HCM: Trẻ, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.