United States. Department of Commerce. "U.S. International Trade in Goods and Services, November 2012, BEA 13-01, CB 13-09, FT-900 (12-11),"
United States Department of Commerce News
(January 11, 2013).
https://fraser.stlouisfed.org/title/6148/item/601525, accessed on May 31, 2026.