एपीए उद्धरण

Jack C. Richards. (1994). Changes intro class - cassette 1. Cambridge, UK: Cambridge Univ. Press.

शिकागो स्टाइल उद्धरण

Jack C. Richards. Changes Intro Class - Cassette 1. Cambridge, UK: Cambridge Univ. Press, 1994.

एमएलए उद्धरण

Jack C. Richards. Changes Intro Class - Cassette 1. Cambridge, UK: Cambridge Univ. Press, 1994.