United States. Bureau of Economic Analysis. "Gross Domestic Product for Puerto Rico, 2021 : Technical Note, BEA 23-35," Bureau of Economic Analysis (BEA) News Releases (July 31, 2023). https://fraser.stlouisfed.org/title/6148/item/639886/content/pdf/bea_newsreleases_23-35_20230731_technicalNote, accessed on March 20, 2025.