एपीए उद्धरण

(1997). Headway intermediate: Student's book. Oxford: Oxford Univ. Press.

शिकागो स्टाइल उद्धरण

Headway Intermediate: Student's Book. Oxford: Oxford Univ. Press, 1997.

एमएलए उद्धरण

Headway Intermediate: Student's Book. Oxford: Oxford Univ. Press, 1997.