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Gaya APA
J.Ongkosaputro, .(2008).4 Langkah Mudah Menguasai English Vocabulary .Jakarta:Jakarta:Wahyumedia.
Gaya MLA
J.Ongkosaputro, ."4 Langkah Mudah Menguasai English Vocabulary".Jakarta:Jakarta:Wahyumedia,2008.Text.