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Nasution, S.. (2003). Metode research penelitian ilmiah . Bandung: Bumi Aksara.

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Nasution, S.. Metode research penelitian ilmiah. Bandung: Bumi Aksara, 2003. .

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Nasution, S.. Metode research penelitian ilmiah. Bandung: Bumi Aksara, 2003. .

Gaya Turabian

Nasution, S.. Metode research penelitian ilmiah. Bandung: Bumi Aksara, 2003. .