Harrison, M., & Mark Harrison. (1995). Grammar Spectrum 2: English rules and practice,Pre-intermediate with answer. Oxford: Oxford University Press.
Trích dẫn kiểu ChicagoHarrison, Mark, và Mark Harrison. Grammar Spectrum 2: English Rules and Practice,Pre-intermediate With Answer. Oxford: Oxford University Press, 1995.
MLA citiranjeHarrison, Mark, và Mark Harrison. Grammar Spectrum 2: English Rules and Practice,Pre-intermediate With Answer. Oxford: Oxford University Press, 1995.
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