Cita APA

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

Citación estilo Chicago

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

Cita MLA

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