Arifianto, Aditya, and Agus Budianto. 2019. “Utilization of Sludge Waste As Fertilizer for Chili Plants: Observed from Technical, Economical Aspects and Farmers’ Perceptions”.
International Journal of Environment, Agriculture and Biotechnology 4 (4).
https://journal-repository.com/index.php/ijeab/article/view/313.