एपीए उद्धरण

(1989). Headway workbook: Advanced. Oxford: Oxford Univ. Press.

शिकागो स्टाइल उद्धरण

Headway Workbook: Advanced. Oxford: Oxford Univ. Press, 1989.

एमएलए उद्धरण

Headway Workbook: Advanced. Oxford: Oxford Univ. Press, 1989.