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WikiPedia: Nhân_khẩu_Bhutan http://www.bhutanobserver.bt/ministry-health-detec... http://www.dop.gov.bt/rep/index.htm http://www.health.gov.bt/doph/cdd/update_HIV2010.p... http://www.umsl.edu/services/govdocs/wofact2007/in... http://esa.un.org/unpd/wpp/unpp/Panel_profiles.htm http://unstats.un.org/unsd/demographic/products/dy... http://unstats.un.org/unsd/demographic/products/vi... https://www.cia.gov/library/publications/the-world... https://www.cia.gov/library/publications/the-world... https://www.cia.gov/library/publications/the-world...