Nasution, S., Arif Lubis, F., & Batubara, C. (2023). Opportunities and Challenges in Implementing Halal Tourism Destinations in the Lake Toba Parapat Area, Simalungun Regency. Indonesian Interdisciplinary Journal of Sharia Economics (IIJSE), 6(2), 1262-1288. https://doi.org/10.31538/iijse.v6i2.3851