1. National Travel and Tourism Office. International Visitation to and from the United States; Arrivals to the United States. Fact Sheet 2022. Available at: https://www.commerce.gov/news/fact-sheets/2022/06/fact-sheet-2022-national-travel-and-tourism-strategy, Accessed 26 September, 2023.
2. Department of Commerce; International Trade Administration. Interim study and report to Congress on the effects of the COVID-19 Pandemic on the travel and tourism industry of the United States. Available at: https://www.trade.gov/sites/default/files/2023-06/INTERIM%20REPORT%20TO%20CONGRESS%20-%20EFFECTS%20OF%20THE%20COVID19%20PANDEMIC_FINAL_0.pdf, Accessed 26 September, 2023.
3. Department of Commerce, International Trade Commission. Available at: Travel.trade.gov/outreachpages/download_data_table/2017_Outbound_Analysis, Accessed 26 September, 2023.
4. Centers for Disease Control. Yellow Book 2024. Health Care Travel Abroad: Travel Insurance, Travel Health Insurance, and Medical Evacuation Insurance. Available at: https://www.nc.cdc.gov/travel/yellowbook/2024/health-care-abroad/insurance, Accessed 26 September, 2023.
5. Centers for Disease Control. Yellow Book 2004. Available at: https://www.nc.cdc.gov/travel/page/yellowbook-home, Accessed 26 September, 2023.