Astuti, E. M. (2011). ENGLISH ZONE for Senior High School Year XI. Erlangga.
Lua i Stíl Chicago (17ú heag.)Astuti, Eka Mulya. ENGLISH ZONE for Senior High School Year XI. Erlangga, 2011.
Lua MLA (8ú heag.)Astuti, Eka Mulya. ENGLISH ZONE for Senior High School Year XI. Erlangga, 2011.
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