Lubis, A. A., S. Kalo, M. Ablisar, and S. Sunarmi. “Police Description In The Investigation of Criminal Narcotics (study at the North Sumatera National Narcotics Agency)”. LEGAL BRIEF, vol. 10, no. 1, Nov. 2020, pp. 26-38, https://legal.isha.or.id/index.php/legal/article/view/23.