Soars, L., & Soars, J. (1998). New Headway English Course, Upper-Intermediate: Teacher's Book. Oxford: Oxford University Press.
Chicago Style aipamenaSoars, Liz, và John Soars. New Headway English Course, Upper-Intermediate: Teacher's Book. Oxford: Oxford University Press, 1998.
MLA aipamenaSoars, Liz, và John Soars. New Headway English Course, Upper-Intermediate: Teacher's Book. Oxford: Oxford University Press, 1998.
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