Gaya APA
      Workbook Longman Keystone 7;Text;;;Pearson;2014;;;428 Cha;Indonesia;Texas;428/11159;;;;;;. ().
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Gaya Chicago
      Workbook Longman Keystone 7;Text;;;Pearson;2014;;;428 Cha;Indonesia;Texas;428/11159;;;;;;.
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Gaya MLA
      Workbook Longman Keystone 7;Text;;;Pearson;2014;;;428 Cha;Indonesia;Texas;428/11159;;;;;;.
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Gaya Turabian
      Workbook Longman Keystone 7;Text;;;Pearson;2014;;;428 Cha;Indonesia;Texas;428/11159;;;;;;.
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