APA (7th ed.) Citation

Programme, U. N. E., Society, T. I. E., & DTIE. (2016). Tourism in the Polar Regions: The Sustainability Challenge.

Chicago Style (17th ed.) Citation

Programme, United Nations Environment, The International Ecotourism Society, and DTIE. Tourism in the Polar Regions: The Sustainability Challenge. 2016.

MLA (9th ed.) Citation

Programme, United Nations Environment, et al. Tourism in the Polar Regions: The Sustainability Challenge. 2016.