Astuti, E. M. (2011). ENGLISH ZONE for Senior High School Year XI. Erlangga.
Cita Chicago Style (17a ed.)Astuti, Eka Mulya. ENGLISH ZONE for Senior High School Year XI. Erlangga, 2011.
Cita MLA (8a ed.)Astuti, Eka Mulya. ENGLISH ZONE for Senior High School Year XI. Erlangga, 2011.
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