एपीए उद्धरण

(1989). Headway teacher's book: Advanced. Oxford: Oxford University Press.

शिकागो स्टाइल उद्धरण

Headway Teacher's Book: Advanced. Oxford: Oxford University Press, 1989.

एमएलए उद्धरण

Headway Teacher's Book: Advanced. Oxford: Oxford University Press, 1989.