एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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