Digital Marketing Application to the Coffee Marketing System at PT Bogor Kopi IndonesiaVeralianta Br Sebayang, Doni Sahat Tua Manalu, Suharno Suharno and Widya Hasian SitumeangE3S Web Conf., 454 (2023) 03025DOI: https://doi.org/10.1051/e3sconf/202345403025