A. Syaifuddin, R. Saptono, A. Rohmadi, B. Widoyono, and B. Hendrasuryawan, “Optimizing E-commerce Personalization through Hybrid Decision Tree–Nearest Neighbor Recommendation Integration”, J. Tek. Inform. (JUTIF), vol. 7, no. 2, pp. 1028–1039, Apr. 2026.