〈妙高号〉運転終了 [Myōkō service discontinued]. RM News (in Japanese). Japan: Neko Publishing Co., Ltd. 16 March 2015. Retrieved 16 March 2015.
jreast.co.jp
"2012 年3 月ダイヤ改正について" [March 2012 Timetable Revision] (PDF). News Release (in Japanese). Nagano, Japan: East Japan Railway Company Nagano Branch. 16 December 2011. p. 5. Retrieved 18 February 2012.