Littlejohn, A. (1998). Cambridge English worldwide: Workbook. Cambridge, UK: Cambridge University Press.
シカゴスタイル引用形Littlejohn, Andrew. Cambridge English Worldwide: Workbook. Cambridge, UK: Cambridge University Press, 1998.
MLA引用形式Littlejohn, Andrew. Cambridge English Worldwide: Workbook. Cambridge, UK: Cambridge University Press, 1998.
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