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UNCTAD (2020) Coronavirus will cost global tourism at least $1.2 trillion. https://unctad.org/news/coronavirus-will-cost-global-tourism-least-12-trillion

Pueyo,T. (2020) To stop the coronavirus, the most successful countries slammed their doors shut to visitors. It worked.Until they let outsiders back in. https://www.nytimes.com/interactive/2020/09/14/opinion/politics/coronavirus-close-borders-travel-quarantine.html?campaign_id=2&emc=edit_th_20200915&instance_id=22195&nl=todaysheadlines&regi_id=59204523&segment_id=38077&user_id=b3443b7f7e341d9be4b1361ecac13e2d

UNCTAD (2020) Coronavirus will cost global tourism at least $1.2 trillion. United Nations Conference on Trade and Development. Retrieved from https://unctad.org/en/pages/newsdetails.aspx?OriginalVersionID=2416