Tài liệu tham khảo WikiPedia: Bằng_Việt http://www.thivien.net/viewauthor.php?UID=aMN7s3bV... http://vnexpress.net/Vietnam/Van-hoa/2005/08/3B9E1... http://www.cpv.org.vn/details.asp?topic=109&subtop...