Nguyễn Quốc Hùng. (1998). English in Focus Level B workbook. TPHCM.
Trích dẫn kiểu ChicagoNguyễn Quốc Hùng. English in Focus Level B Workbook. TPHCM, 1998.
MLA引文Nguyễn Quốc Hùng. English in Focus Level B Workbook. TPHCM, 1998.
警告：這些引文格式不一定是100％准確.
APA引文