Astuti, E. M. (2011). ENGLISH ZONE for Senior High School Year XI. Erlangga.
Chicagoスタイル(17版)引用形式Astuti, Eka Mulya. ENGLISH ZONE for Senior High School Year XI. Erlangga, 2011.
MLA(8版)引用形式Astuti, Eka Mulya. ENGLISH ZONE for Senior High School Year XI. Erlangga, 2011.
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