एपीए उद्धरण

Collins Cobuild. (2012). Collins Cobuild Key Words for IELTS. TP. HCM: Tổng hợp.

शिकागो स्टाइल उद्धरण

Collins Cobuild. Collins Cobuild Key Words for IELTS. TP. HCM: Tổng hợp, 2012.

एमएलए उद्धरण

Collins Cobuild. Collins Cobuild Key Words for IELTS. TP. HCM: Tổng hợp, 2012.