M.I., I.(20,012,003).English pronunciation : the english speech sounds theory n practice / M.I. Indriani (Cet.1,2).Jakarta:Gramedia Pustaka Utama.
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Indriani, M.I.."English pronunciation : the english speech sounds theory n practice / M.I. Indriani".Cet.1,2Jakarta:Gramedia Pustaka Utama,20,012,003.Textbook.