Hermawan, Iwan, Gita Hindrawati, Yusuf Dewantoro, and Sartono Sartono. 2024. “An Exploratory Study Factor Analysis for Roasting Machine Development and Its Impact on Robusta Coffee Product Quality”. International Conference on Digital Business Innovation and Technology Management (ICONBIT) 1 (1). https://proceeding.unesa.ac.id/index.php/iconbit/article/view/4211.