“Unlocking the Potential of Biochar Based Slow-Release Fertilizers: a Systematic Review” (2024) International Journal of Sustainability in Research (IJSR), 1(3), hlm. 171–184. Tersedia pada: https://www.penerbitjurnalinternasional.com/index.php/ijsr/article/view/736 (Diakses: 1 September 2026).