Sudarwati, M. (2008). Look Ahead Book 2 An English Course for Senior High School Students Year XI (SMA/MA) Language Study Programme. Erlangga.
Chicago-referens (17:e uppl.)Sudarwati, M. Look Ahead Book 2 An English Course for Senior High School Students Year XI (SMA/MA) Language Study Programme. Erlangga, 2008.
MLA-referens (8:e uppl.)Sudarwati, M. Look Ahead Book 2 An English Course for Senior High School Students Year XI (SMA/MA) Language Study Programme. Erlangga, 2008.
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