Harrison, M. (1995). Grammar spectrum: Pre-intermediate : with answers. New York: Oxford University Press.
Trích dẫn kiểu ChicagoHarrison, Mark. Grammar Spectrum: Pre-intermediate : With Answers. New York: Oxford University Press, 1995.
MLA CitationHarrison, Mark. Grammar Spectrum: Pre-intermediate : With Answers. New York: Oxford University Press, 1995.
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