APA ציטוט

David Riley. (1999). Business listening and speaking (Pre-intermediate). Essex, UK: Longman.

Trích dẫn kiểu Chicago

David Riley. Business Listening and Speaking (Pre-intermediate). Essex, UK: Longman, 1999.

ציטוט MLA

David Riley. Business Listening and Speaking (Pre-intermediate). Essex, UK: Longman, 1999.