United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services: December 2016, BEA 17-06, CB 17-17, FT-900 (16-12)," Bureau of Economic Analysis (BEA) News Releases (February 7, 2017). https://fraser.stlouisfed.org/title/6148/item/602477, accessed on September 18, 2024.