Bivens, L. Josh (December 14, 2004). "Debt and the dollar"(PDF). EPI Issue Brief (203). Economic Policy Institute. p. 2, "US external debt obligations". Archived from the original(PDF) on December 17, 2004. Retrieved July 8, 2007.
Bivens, L. Josh (December 14, 2004). "Debt and the dollar"(PDF). EPI Issue Brief (203). Economic Policy Institute. p. 2, "US external debt obligations". Archived from the original(PDF) on December 17, 2004. Retrieved July 8, 2007.