एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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