M. P. E. Berti, T. B. W. Rahardjo, T. Indrajaya, S. Maemun, and A. D. Widiantari, “The Influence of the 7P Marketing Mix (Product, Price, Place, Promotion, People, Process, Physical Evidence) on Patient Loyalty”, IJGHR, vol. 8, no. 3, pp. 1271–1276, Jun. 2026.