D. Widayanti, M. Mahamita, Y. N. Anggraeni, and P. . Heriyati, “The Impact of AI-Based Chatbot Customer Service on Customer Loyalty: The Mediating Role of Customer Satisfaction, Customer Engagement, and Perceived Service Efficiency at Bank X”, DIJEMSS, vol. 7, no. 1, pp. 831–847, Oct. 2025.