Ermarilla, Hedi, et al. “The Effect of Mulch Types With Dose of N, P, and K Fertilizer in Summed Dominan Ratio and Biomass Weed Arabica (Coffea Arabica L.) Coffee in Indonesia”. International Journal of Environment, Agriculture and Biotechnology, vol. 4, no. 1, Oct. 2019, https://journal-repository.com/index.php/ijeab/article/view/687.