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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.