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REFERENCES Dardjowidjojo, Soenjono. 2003. Psikolinguistik: Pengantar Pemahaman Bahasa Manusia. Jakarta: Yayasan Obor Indonesia. Hornby, A.S. 1989. Oxford Advanced Learner’s Dictionary (New Edition). Oxford: Oxford University Press. Hussain, Sarmad. 2009. Phonetics and Phonology: An Introduction. Online (). Accessed on February 23, 2009. Nababan, Sri Utari subyakto. 1992. Psikolinguistik: Suatu Pengantar. Jakarta: PT Gramedia Pustaka Utama. Philips, Colin. 1999. Phonetics I. Online (). Accessed on February 22, 2009. Unanimi. 2008. The Human Speech Apparatus. Online (). Accessed on February 22, 2009.