Bernard Comrie, Encarta Encyclopedia (1998); George Weber "Top Languages: The World's 10 Most Influential Languages" in Language Today (Vol. 2, Dec 1997) "Archived copy". Archived from the original on 2011-09-27. Retrieved 2011-09-28.
Bernard Comrie, Encarta Encyclopedia (1998); George Weber "Top Languages: The World's 10 Most Influential Languages" in Language Today (Vol. 2, Dec 1997) "Archived copy". Archived from the original on 2011-09-27. Retrieved 2011-09-28.