DJAJAKIRANA, Gunawan. Direct and Indirect Methods of Soil Microbial-Biomass Determination: Weakness and Strength. Jurnal Ilmu Tanah dan Lingkungan, [S. l.], v. 5, n. 1, p. 29–38, 2003. DOI: 10.29244/jitl.5.1.29-38. Disponível em: https://journal.ipb.ac.id/jtanah/article/view/2331. Acesso em: 25 dec. 2025.