APA aipamena

Marc Helgesen. (1998). Office File (Student book). Essex, England: longman.

Chicago Style aipamena

Marc Helgesen. Office File (Student Book). Essex, England: longman, 1998.

MLA aipamena

Marc Helgesen. Office File (Student Book). Essex, England: longman, 1998.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.