United States. Department of Commerce. "Travel and Tourism Spending Accelerated in the Third Quarter 2017 : Full Release, BEA 17-66,"
United States Department of Commerce News
(December 13, 2017).
https://fraser.stlouisfed.org/title/6148/item/602537/content/pdf/bea_newsreleases_20171213, accessed on June 12, 2026.