F. Muhammad, F. Yusrizal, A. Nawawi, R. Nurita, N. Yulia, and J. jumiati, “Analysis of the 4A Concept (Attraction, Amenity, Accessibility, and Ancillary Services) at the Mangrove Sungai Bersejarah Ecotourism Destination, Siak Regency”, JKPBP, vol. 7, no. 1, pp. 12-25, Apr. 2026.