Sianipar, M. (2019) “Effect of Product, Price, Location and Tourism Promotion of Interest in Visiting Lake Toba Tourist Attraction”, Journal of Management Science (JMAS), 2(3, Juli), pp. 50–55. Available at: https://exsys.iocspublisher.org/index.php/JMAS/article/view/31 (Accessed: 2May2026).