Md Taff, M. A., and S. N. Mohd Yaakob. “Pendidikan Luar Di Malaysia: Outdoor Education in Malaysia”. Perspektif Jurnal Sains Sosial Dan Kemanusiaan, vol. 2, no. 2, Nov. 2010, pp. 61-73, https://ojs.upsi.edu.my/index.php/PERS/article/view/1584.