*1994-1999: U. S. Department of Treasury (March 2005). ''Treasury Bulletin'', p. 51. Washington D.C.: Government Printing Office.
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*2000-2014: U. S. Department of Treasury (November 2014). [http://www.treasury.gov/ticdata/Publish/mfhhis01.txt "Major foreign holders of treasury securities".] Department of Treasury website. Retrieved on December 29, 2014.</ref>
*1994-1999: U. S. Department of Treasury (March 2005). ''Treasury Bulletin'', p. 51. Washington D.C.: Government Printing Office.
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*2000-2014: U. S. Department of Treasury (November 2014). [http://www.treasury.gov/ticdata/Publish/mfhhis01.txt "Major foreign holders of treasury securities".] Department of Treasury website. Retrieved on December 29, 2014.</ref>