Krisdayanti, Kiki, and M. Soekarno Putra. “Pengembangan Program Internet Of Things Pada Coffee Vending Machine”. JUPITER: Jurnal Penelitian Ilmu Dan Teknologi Komputer, vol. 15, no. 1c, Apr. 2023, pp. 444-51, https://doi.org/10.5281./5549/15.jupiter.2023.04.