एपीए उद्धरण

Barrall, I. (2009). Intelligent business coursebook upper intermediate. Oxford University Press.

शिकागो स्टाइल उद्धरण

Barrall, Irene. Intelligent Business Coursebook Upper Intermediate. Oxford University Press, 2009.

एमएलए उद्धरण

Barrall, Irene. Intelligent Business Coursebook Upper Intermediate. Oxford University Press, 2009.