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Nasution, S.. (1995, 2003). Metode Research: Penelitian Ilmiah (1st.Ed.,). Jakarta: Bumi Aksara.

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Nasution, S.. Metode Research: Penelitian Ilmiah. 1st.Ed., Jakarta: Bumi Aksara, 1995, 2003. Text.

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Nasution, S.. Metode Research: Penelitian Ilmiah. 1st.Ed., Jakarta: Bumi Aksara, 1995, 2003. Text.

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Nasution, S.. Metode Research: Penelitian Ilmiah. 1st.Ed., Jakarta: Bumi Aksara, 1995, 2003. Print.