Websites

https://www.tudiendanhngon.vn/danhngon/han-hoc-danh-ngon

https://triethocdoisong.wordpress.com/

http://triancuocdoi.blogspot.com/

http://dodinhtuan.blogspot.com/

http://chimviet.free.fr/tacgia/dodinhtuan.htm

http://dangxuanxuyen.blogspot.com/2015/11/tim-hieu-ve-nguyen-ly-cua-ngu-hanh-tac.html

http://dangxuanxuyen.blogspot.com/2016/01/ngu-hanh-nap-am-la-gi-tac-gia-oan-manh.html