Koenig, C. L., Oxenden, C., & Seligson, P. (2013). American English file: Teacher's book. Oxford: Oxford University Press.
استشهاد بنمط شيكاغوKoenig, Chistina Latham, Clive Oxenden, و Paul Seligson. American English File: Teacher's Book. Oxford: Oxford University Press, 2013.
MLA استشهادKoenig, Chistina Latham, Clive Oxenden, و Paul Seligson. American English File: Teacher's Book. Oxford: Oxford University Press, 2013.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.