Sabela, Noverta, and Siti Aminah. “Determinants of Purchasing Decisions for Kopi Janji Jiwa in Sidoarjo: The Role of Digital Marketing and E-WOM”. Golden Ratio of Marketing and Applied Psychology of Business, vol. 6, no. 2, June 2026, pp. 652-65, doi:10.52970/grmapb.v6i2.2278.