"一般国道の路線別、都道府県別道路現況" [Road statistics by General National Highway route and prefecture] (PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Retrieved 19 February 2020.
qsr.mlit.go.jp
一般国道10号 (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism, Kyushu Regional Development Bureau. Retrieved 4 December 2010.