Tài liệu tham khảo WikiPedia: Vũ_Năng_An http://www.hanoimoi.com.vn/vn/53/98062/ http://www1.laodong.com.vn/pls/bld/display$.htnoid... http://www.vnn.vn/vanhoa/vandekhac/2004/07/174437/