Shinopii (22 February 2017). "日本全国にメロディーロードは28箇所ある!" [The 28 Melody Roads of Japan] (in Japanese). Retrieved 18 February 2020.
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"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.