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“Optimalisasi Pembinaan Informan Satuan Narkoba Dalam Mengungkap Peredaran Narkoba Di Wilayah Hukum Polres Purworejo”. Indonesian Journal of Police Studies 8, no. 1 (June 30, 2017). Accessed August 25, 2026. http://journal.akpol.ac.id/index.php/ijps/article/view/66.