United States. Department of Commerce. "U.S. International Trade in Goods and Services: November 2017, BEA 18-01, CB 18-04, FT-900 (17-11),"
United States Department of Commerce News
(January 5, 2018).
https://fraser.stlouisfed.org/title/6148/item/602608, accessed on June 1, 2026.