Askarpour, Elnaz, et al. “Assessing the Viability and Potential for Developing Tourism Industry in Lavasan City Using the IUCN Model”. International Journal of Bio-Resource and Stress Management, vol. 2, no. Sep, 3, Sept. 2011, pp. 373-6, https://www.ojs.pphouse.org/index.php/IJBSM/article/view/176.