एपीए उद्धरण

Koenig, C. L., Oxenden, C., & Paul Seligson. (2013). American English file: Online practice. Oxford: Oxford University Press.

शिकागो स्टाइल उद्धरण

Koenig, Chistina Latham, Clive Oxenden, और Paul Seligson. American English File: Online Practice. Oxford: Oxford University Press, 2013.

एमएलए उद्धरण

Koenig, Chistina Latham, Clive Oxenden, और Paul Seligson. American English File: Online Practice. Oxford: Oxford University Press, 2013.