“Waste Processing As Organic Compost Fertilizer Using Smart Composter in Sei Ular Village, Secanggang District, Langkat Regency”. Journal of Saintech Transfer 5, no. 1 (June 8, 2022): 13–20. Accessed February 4, 2026. https://idjpcr.usu.ac.id/jst/article/view/8740.