Naldi, Jefri, and Siti Fatimah. “Historical Insight and Characteristic Culture Value of Historical Tour Guide in Japanese Tunnel Tourism Object”. Science and Environmental Journal for Postgraduate 1, no. 2 (June 1, 2019): 61–68. Accessed April 30, 2026. https://senjop.ppj.unp.ac.id/index.php/senjop/article/view/23.