Tài liệu tham khảo

WikiPedia: Phan_Kế_Toại http://123.30.49.74:8080/tiengviet/tulieuvankien/4... http://www.anninhthudo.vn/tianyon/Index.aspx?Artic... http://www.hanoimoi.com.vn/newsdetail/1000_nam_tha... http://www.thanhnien.com.vn/news/Pages/200936/2009... http://daidoanket.vn/index.aspx?Menu=1501&chitiet=... http://www.mofa.gov.vn/quocte/3,02/ng&bd17,1,02.ht... http://www.na.gov.vn/htx/vietnamese/default.asp?Ne... http://vietnamnet.vn/vn/giao-duc/197366/huy-chuong... http://hanoi.vnn.vn/chuyen_de/langque/langnoitieng...