Arcana, K. T. P., and K. Wiweka. “Educational tourism’s Product Strategy at Batur Global Geopark, Kintamani, Bali”. International Research Journal of Management, IT and Social Sciences, vol. 3, no. 7, July 2016, pp. 43-52, https://sloap.org/journals/index.php/irjmis/article/view/384.