* [http://india.gov.in/knowindia/official_language.php The Union: Official Language]
* [http://www.unicode.org/charts/PDF/U0900.pdf Official Unicode Chart for Devanagari (PDF)]
* [http://hi.wikipedia.org/wiki/Web_Hindi_Resources Web Hindi Resources]
* [http://books.google.co.in/books?id=hsxYepfLZyEC&pg=PA367&lpg=PA367&dq=quail++%26+hindi&source=bl&ots=tAnqpF3WTn&sig=lRVe6LZVO57ic3TMI6kZhvH1RFs&hl=hi&ei=sNSoSZPOJYbRkAWDkfnkDQ&sa=X&oi=book_result&resnum=8&ct=result#v=onepage&q&f=false '''Hindi-Hindi-Tamil-English Dictionary'''] (Googe Book ; By R Rangarajan)