一般国道４号 (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Kanto Regional Development Bureau. Archived from the original on 30 July 2010. Retrieved 29 November 2010.
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"CHOKOTABI SAITAMA"(PDF). Saitama Prefecture, Industry & Labor Department, Tourism Division. Retrieved 4 March 2020.
一般国道４号 (in Japanese). Ministry of Land, Infrastructure, Transport and Tourism. Kanto Regional Development Bureau. Archived from the original on 30 July 2010. Retrieved 29 November 2010.
