Nur Amanina Mazlan, A. S. S. G. T. L. “Cave Stability and Sustainable Development: A Case Study at KEK Look Tong Cave, Perak”. International Journal of Advanced Science and Technology, Vol. 29, no. 1, Jan. 2020, pp. 1435- 1454, http://sersc.org/journals/index.php/IJAST/article/view/3708.