“Unlocking the Potential of Biochar Based Slow-Release Fertilizers: a Systematic Review”, IJSR, vol. 1, no. 3, hlm. 171–184, Okt 2024, Diakses: Sep 01, 2026. Tersedia pada: https://www.penerbitjurnalinternasional.com/index.php/ijsr/article/view/736