Sudarwati, M. (2008). Look Ahead Book 1 An english Course for Senior High School Students Year X (SMA & MA). Erlangga.
Lua i Stíl Chicago (17ú heag.)Sudarwati, M. Look Ahead Book 1 An English Course for Senior High School Students Year X (SMA & MA). Erlangga, 2008.
Lua MLA (8ú heag.)Sudarwati, M. Look Ahead Book 1 An English Course for Senior High School Students Year X (SMA & MA). Erlangga, 2008.
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