एपीए उद्धरण

(1993). Headway Upper-immediate: (Student's book). Oxford: Oxford University Press.

शिकागो स्टाइल उद्धरण

Headway Upper-immediate: (Student's Book). Oxford: Oxford University Press, 1993.

एमएलए उद्धरण

Headway Upper-immediate: (Student's Book). Oxford: Oxford University Press, 1993.