Sastro, S. J., Y. Yuwana, and E. Silvia. “YSD UNIB 12 SOLAR DRYER PERFORMANCE FOR ROBUSTA CAFFEE DRYING”. Jurnal Agroindustri, vol. 4, no. 2, Nov. 2014, pp. 78-85, doi:10.31186/j.agroindustri.4.2.78-85.