Firmansyah, M. A., & Bhermana, A. (2020). Characterization of Earthworms (Lumbriscus terestris) Population Under Several Area of Shallots Cultivation. Jurnal Lahan Suboptimal : Journal of Suboptimal Lands, 9(2), 208–217. https://doi.org/10.33230/JLSO.9.2.2020.508