Thaibil Anwar, Eka Nurmala, Wahyudi, Sanusi, Sultan, and Muhammad David. “COST EFFECTIVE APPROACH: OPTIMAL CONTROL APPLICATION IN NARCOTICS ABUSE MODEL BY INVOLVING THE NUMBER OF DEATHS”. International Journal of Economic, Business, Accounting, Agriculture Management and Sharia Administration (IJEBAS) 6, no. 3 (June 17, 2026): 1519–1531. Accessed July 19, 2026. https://radjapublika.com/index.php/IJEBAS/article/view/5908.