Gairns, R., & Redman, S. (2006). Natural English: Elementary student's book. Oxford University Press.
Chicagoスタイル(17版)引用形式Gairns, Ruth, , Stuart Redman. Natural English: Elementary Student's Book. Oxford: Oxford University Press, 2006.
MLA(8版)引用形式Gairns, Ruth, , Stuart Redman. Natural English: Elementary Student's Book. Oxford University Press, 2006.
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