แหล่งที่มา WikiPedia: อวี๋_ซาน https://books.google.com/books?id=rverDwAAQBAJ https://books.google.com/books?id=22alDAAAQBAJ https://books.google.com/books?id=Nh3zAwAAQBAJ https://books.google.com/books?id=KNi7CwAAQBAJ https://books.google.com/books?id=8tkABAAAQBAJ https://books.google.com/books?id=DGbyzKLVh30C https://web.archive.org/web/20090408200053/http://... http://www.chinaculture.org/gb/cn_zgwh/2004-06/28/...
