United States. Bureau of Economic Analysis. "U.S. International Trade in Goods and Services: February 2020 : Historical Comparisons, BEA 20-16, CB 20-52," Bureau of Economic Analysis (BEA) News Releases (April 2, 2020). https://fraser.stlouisfed.org/title/6148/item/602891/content/pdf/bea_newsreleases_20200402_historical-comparisons, accessed on March 12, 2025.