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Suwartono, Suwartono (2008) IT SOUNDS LIKE NATIVE ENGLISH Approaching the Native Speakers' Pronunciation. SPIRIT for education and development. ISBN 978-979-1068-10
Suwartono, Suwartono (2008) SUKSES BELAJAR BAHASA ASING. CV. Mimbar Media Utama. ISBN 979-9036-04-6