Analysis of information sources in references of the Wikipedia article "کارولینای شمالی" in Persian language version.
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(help) Retrieved on 2006-11-06.{{citation}}
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(help) Retrieved on 2006-11-06.Wikipedia contributors, "Comparison between U.S. states and countries nominal GDP," Wikipedia, The Free Encyclopedia, http://en.wikipedia.org/wiki/Comparison_between_U.S._states_and_countries_nominal_GDP (accessed September 5, 2008).