Yusibani, E., I. ikramullah, E. Yufita, Z. Jalil, and E. Suhendi. “The Effect of Temperature and Roasting Time on The Physical Properties of Arabica and Robusta Gayo Coffee Bean”. Journal of Applied Agricultural Science and Technology, vol. 7, no. 2, May 2023, pp. 100-8, doi:10.55043/jaast.v7i2.75.