APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.