Hanifah, Muhamad Abu, et al. “Heat Pump Drying of Arabica Coffee Beans: Influence of Inlet Air Conditions on Drying Rate Constant”. Jurnal Konversi Energi Dan Manufaktur, vol. 10, no. 2, July 2025, pp. 140 – 149, doi:10.21009/JKEM.10.2.5.