Y. P. Situmeang, I. D. N. Sudita, and M. Suarta, “Application of Compost and Biochar from Cow, Goat, and Chicken Manure to Restore Soil Fertility and Yield of Red Chili”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 11, no. 5, pp. 2008–2015, Oct. 2021.