एपीए उद्धरण

Peter May. (1999). Knockout first certificate ( Student's book ). Oxford: Oxford Univ. Press.

शिकागो स्टाइल उद्धरण

Peter May. Knockout First Certificate ( Student's Book ). Oxford: Oxford Univ. Press, 1999.

एमएलए उद्धरण

Peter May. Knockout First Certificate ( Student's Book ). Oxford: Oxford Univ. Press, 1999.