United States. Department of Commerce. "Outdoor Recreation Satellite Account: Prototype Estimates for 2012-2016 : Full Release, BEA 18-07,"
United States Department of Commerce News
(February 14, 2018).
https://fraser.stlouisfed.org/title/6148/item/602614/content/pdf/bea_newsreleases_20180214, accessed on June 1, 2026.