एपीए उद्धरण

Collins Cobuild, & Williams, A. (2012). Collins Vocabulary for IELTS. TP. HCM: Tổng hợp.

शिकागो स्टाइल उद्धरण

Collins Cobuild, और Anneli Williams. Collins Vocabulary for IELTS. TP. HCM: Tổng hợp, 2012.

एमएलए उद्धरण

Collins Cobuild, और Anneli Williams. Collins Vocabulary for IELTS. TP. HCM: Tổng hợp, 2012.