(1991). Cambridge proficiency examination practice 4 (Teacher's book). Cambridge, UK: Cambridge Univ. Press.
シカゴスタイル引用形Cambridge Proficiency Examination Practice 4 (Teacher's Book). Cambridge, UK: Cambridge Univ. Press, 1991.
MLA引用形式Cambridge Proficiency Examination Practice 4 (Teacher's Book). Cambridge, UK: Cambridge Univ. Press, 1991.
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