Nguyễn Quốc Hùng. (1998). English in Focus Level B workbook. TPHCM.
Chicago Style aipamenaNguyễn Quốc Hùng. English in Focus Level B Workbook. TPHCM, 1998.
MLA aipamenaNguyễn Quốc Hùng. English in Focus Level B Workbook. TPHCM, 1998.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.