Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian (编). Standard English. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History. 2016.
lilaproject.org
Tropf, Herbert S. India and its Languages(PDF). Siemens AG, Munich. 23 January 2004 [28 January 2024]. (原始内容存档(PDF)于08 March 2008).请检查|archive-date=中的日期值 (帮助) 引文格式1维护:日期与年 (link)
Table C-17: Population by Bilingualism and trilingualism, 2001 Census of India [1] (页面存档备份,存于互联网档案馆)
Tropf, Herbert S. India and its Languages(PDF). Siemens AG, Munich. 23 January 2004 [28 January 2024]. (原始内容存档(PDF)于08 March 2008).请检查|archive-date=中的日期值 (帮助) 引文格式1维护:日期与年 (link)