Tài liệu tham khảo

WikiPedia: Văn_Lang http://www.britannica.com/EBchecked/topic/622714 http://tuanhsl.blogspot.de/2007/11/ti-sao-ni-nh-nc... http://www.academia.edu/3554295/The_Biography_of_t... http://www.academia.edu/3659357/Tai_Words_and_the_... http://baotangnhanhoc.org/vi/index.php?option=com_... http://thuvienso.thuvienbrvt.com.vn/doc/viet-su-lu... http://khoalichsu.edu.vn/index.php?option=com_cont... http://bachkhoatoanthu.vass.gov.vn/noidung/tudien/... http://www.ictnews.vn/home/1000-nam-Thang-Long/102... https://commons.wikimedia.org/wiki/Category:V%C4%8...