Hardiyanti, T., Paningrum, D. and Sutopo, A.B. 2025. Marketing Mix 9P Strategy in Sustaining a Souvenir Shop Business: Strategi Marketing Mix 9P dalam Mempertahankan Bisnis Toko Souvenir. Indonesian Journal of Innovation Studies. 26, 3 (Jul. 2025), 10.21070/ijins.v26i3.1579.