Koenig, C. L., & Oxenden, C. (2013). American English file: Teacher's book. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoKoenig, Chistina Latham, và Clive Oxenden. American English File: Teacher's Book. Oxford: Oxford University Press, 2013.
MLA CitationKoenig, Chistina Latham, và Clive Oxenden. American English File: Teacher's Book. Oxford: Oxford University Press, 2013.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.