Tài liệu tham khảo

WikiPedia: Nậm_Lằn //tools.wmflabs.org/geohack/geohack.php?language=v... //tools.wmflabs.org/geohack/geohack.php?language=v... //tools.wmflabs.org/geohack/geohack.php?language=v... //tools.wmflabs.org/geohack/geohack.php?language=v... https://www.google.com/maps/@22.5707052,102.494640... https://vnexpress.net/du-lich/ve-ky-vi-o-noi-song-... https://commons.wikimedia.org/wiki/Category:Rivers... https://thuvienphapluat.vn/van-ban/Linh-vuc-khac/Q... https://thuvienphapluat.vn/van-ban/Xay-dung-Do-thi...