"Countries Compared by Economy > Debt > External. International Statistics at NationMaster.com", CIA World Factbooks 18 December 2003 to 28 March 2011. Aggregates compiled by NationMaster. Retrieved from http://www.nationmaster.com/country-info/group-stats/Non--religious-countries/Economy/Debt/External
"Countries Compared by Economy > Debt > External. International Statistics at NationMaster.com, CIA World Factbooks 18 December 2003 to 28 March 2011. Aggregates compiled by NationMaster." 2000-2012. <http://www.nationmaster.com/country-info/group-stats/Non--religious-countries/Economy/Debt/External>.
'Countries Compared by Economy > Debt > External. International Statistics at NationMaster.com, CIA World Factbooks 18 December 2003 to 28 March 2011. Aggregates compiled by NationMaster.', <http://www.nationmaster.com/country-info/group-stats/Non--religious-countries/Economy/Debt/External> [assessed 2000-2012]
"Countries Compared by Economy > Debt > External. International Statistics at NationMaster.com", CIA World Factbooks 18 December 2003 to 28 March 2011. Aggregates compiled by NationMaster. [Internet]. 2000-2012. Avaliable from: <http://www.nationmaster.com/country-info/group-stats/Non--religious-countries/Economy/Debt/External>.
"Countries Compared by Economy > Debt > External. International Statistics at NationMaster.com", CIA World Factbooks 18 December 2003 to 28 March 2011. Aggregates compiled by NationMaster. Avaliable at: nationmaster.com. Assessed 2000-2012.
"Countries Compared by Economy > Debt > External. International Statistics at NationMaster.com, CIA World Factbooks 18 December 2003 to 28 March 2011. Aggregates compiled by NationMaster.," http://www.nationmaster.com/country-info/group-stats/Non--religious-countries/Economy/Debt/External (assessed 2000-2012)
"Countries Compared by Economy > Debt > External. International Statistics at NationMaster.com", CIA World Factbooks 18 December 2003 to 28 March 2011. Aggregates compiled by NationMaster., http://www.nationmaster.com/country-info/group-stats/Non--religious-countries/Economy/Debt/External (last visited 2000-2012)
"Countries Compared by Economy > Debt > External. International Statistics at NationMaster.com", CIA World Factbooks 18 December 2003 to 28 March 2011. Aggregates compiled by NationMaster., http://www.nationmaster.com/country-info/group-stats/Non--religious-countries/Economy/Debt/External (as of 2000-2012)