एपीए उद्धरण

Nguyễn Quốc Hùng. (2006). English in Focus Level C. TPHCM: NXB HCM.

शिकागो स्टाइल उद्धरण

Nguyễn Quốc Hùng. English in Focus Level C. TPHCM: NXB HCM, 2006.

एमएलए उद्धरण

Nguyễn Quốc Hùng. English in Focus Level C. TPHCM: NXB HCM, 2006.