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