United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services: August 2019 : Full Release, BEA 19-51, CB 19-151," Bureau of Economic Analysis (BEA) News Releases (October 4, 2019). https://fraser.stlouisfed.org/title/6148/item/602822/content/pdf/bea_newsreleases_20191004, accessed on March 15, 2025.