Andrian, Giovannio, and Iwan Djoko. “Komunikasi Pemasaran Kedai Kopi Janji Jiwa Geldboom Surabaya Melalui Media Sosial Instagram”. Journal Communication Specialist, vol. 1, no. 2, Sept. 2022, pp. 231-43, https://ejournal.unitomo.ac.id/index.php/jcs/article/view/4815.