Pakbeen, Hesam. “Comparative Study of Leading Cruise Lines’ Sustainability Practices and Environmental Stewardship in Contribution to SDGs’ Sea and Water Conservation Goal”. European Journal of Sustainable Development 7, no. 3 (October 1, 2018): 507. Accessed April 26, 2024. http://ojs.ecsdev.org/index.php/ejsd/article/view/756.