12"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) (dalam bahasa Jepang). Ministry of Land, Infrastructure, Transport and Tourism. Diakses tanggal 19 February 2020.
↑一般国道13号 (dalam bahasa Jepang). Ministry of Land, Infrastructure, Transport and Tourism, Tohoku Regional Development Bureau. Diarsipkan dari asli tanggal 21 July 2011. Diakses tanggal 4 December 2010.