APA aipamena

Nguyễn Quốc Hùng. (1998). English in Focus Level B workbook. TPHCM.

Chicago Style aipamena

Nguyễn Quốc Hùng. English in Focus Level B Workbook. TPHCM, 1998.

MLA aipamena

Nguyễn Quốc Hùng. English in Focus Level B Workbook. TPHCM, 1998.