एपीए उद्धरण

Alex Tilbury. (2011). English unlimited. B1, Pre-intermediate Coursebook with e-Portfolio. Cambridge: Cambridge University Press.

शिकागो स्टाइल उद्धरण

Alex Tilbury. English Unlimited. B1, Pre-intermediate Coursebook With E-Portfolio. Cambridge: Cambridge University Press, 2011.

एमएलए उद्धरण

Alex Tilbury. English Unlimited. B1, Pre-intermediate Coursebook With E-Portfolio. Cambridge: Cambridge University Press, 2011.