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WikiPedia: Ngôn_ngữ_tại_Ấn_Độ http://www.britannica.com/eb/article-46398 http://www.ethnologue.com/show_country.asp?name=IN http://books.google.com/?id=4syP7jPzGSoC http://books.google.com/?id=F3XvBbdWCKYC http://timesofindia.indiatimes.com/india/Theres-no... http://indicpad.com http://www.kamat.com/indica/diversity/languages.ht... http://www.languageinindia.com/ http://www.mapsofindia.com/culture/indian-language... http://titus.uni-frankfurt.de/didact/karten/indi/i...