L.- luk Ilmaknun and M. Y. Zahiroh, “EFFECTIVENESS OF 9P MARKETING MIX STRATEGY IN EFFORTS TO IMPROVE SERVICE QUALITY AT PT. BPRS MITRA MENTARI SEJAHTERA PONOROGO”, ar-rihlah. j. keuang. dan. perbank. syariah., vol. 5, no. 1, pp. 72–85, Jul. 2025.