Department of Economic and Social Affairs Population Division. World Population Prospects, Table A.1(PDF). 2008 revision. United Nations. 2009 [2009-03-12]. （原始内容存档(PDF)于2009-03-18）.
According to Interim Constitution Nepali is only the official language (article 5, point 2). Other languages spoken as the mother tongue in Nepal are the national languages (article 5, point 1). According to article 5, point 3, all languages are accepted as official languages at the regional level. Today's more than 90% people speak Nepali as a 1st language. Nepal_Interim_Constitution2007 （页面存档备份，存于互联网档案馆）
Department of Economic and Social Affairs Population Division. World Population Prospects, Table A.1(PDF). 2008 revision. United Nations. 2009 [2009-03-12]. （原始内容存档(PDF)于2009-03-18）.
According to Interim Constitution Nepali is only the official language (article 5, point 2). Other languages spoken as the mother tongue in Nepal are the national languages (article 5, point 1). According to article 5, point 3, all languages are accepted as official languages at the regional level. Today's more than 90% people speak Nepali as a 1st language. Nepal_Interim_Constitution2007 （页面存档备份，存于互联网档案馆）
