"一般国道465号（黄和田畑拡幅）の一部が開通します。" [Section of National Route 465 to be opened.] (PDF) (in Japanese). Chiba Prefecture. 23 March 2015. Retrieved 22 April 2021.
chibanippo.co.jp
"国道４６５号一部拡幅 ２車線のバイパス完成 君津" [Widening and re-aligning of National Route 465 completed in Kimitsu]. Chiba Nippō (in Japanese). 27 March 2015. Retrieved 23 April 2021.
"ビックリ道路大集合…！これが「酷道・怖道・険道」だ" [Several surprising roads. Cool, scary, and steep roads] (in Japanese). Kodansha. 4 February 2021. Retrieved 20 April 2021.
mlit.go.jp
"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 11 February 2020.
"再評価結果" [Re-evaluation results] (PDF) (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. 2004. Retrieved 23 April 2021.
wikisource.org
ja.wikisource.org
一般国道の路線を指定する政令 [Cabinet Order Designating General National Routes] (in Japanese). Cabinet of Japan. 1965. Retrieved 21 April 2021 – via Wikisource.
