"2020年6月6日(土)東武鉄道・東京メトロダイヤ改正 東武線・日比谷線相互直通列車に初の座席指定制列車「THライナー」が誕生!" [June 6, 2020 (Saturday) Tobu Railway / Tokyo Metro Timetable Revision Tobu Line / Hibiya Line Mutual direct train, the first reserved seat train "TH Liner" is born!] (PDF) (Press release) (in Japanese). 東武鉄道/東京地下鉄. 19 December 2019. Archived from the original(PDF) on 19 December 2019. Retrieved 25 January 2020.
tokyometro.jp
"「営団地下鉄」から「東京メトロ」へ" [From "Teito Rapid Transit Authority" to "Tokyo Metro"]. Tokyo Metro Online. 2006-07-08. Archived from the original on 16 May 2012. Retrieved 29 May 2022.
web.archive.org
"「営団地下鉄」から「東京メトロ」へ" [From "Teito Rapid Transit Authority" to "Tokyo Metro"]. Tokyo Metro Online. 2006-07-08. Archived from the original on 16 May 2012. Retrieved 29 May 2022.
"2020年6月6日(土)東武鉄道・東京メトロダイヤ改正 東武線・日比谷線相互直通列車に初の座席指定制列車「THライナー」が誕生!" [June 6, 2020 (Saturday) Tobu Railway / Tokyo Metro Timetable Revision Tobu Line / Hibiya Line Mutual direct train, the first reserved seat train "TH Liner" is born!] (PDF) (Press release) (in Japanese). 東武鉄道/東京地下鉄. 19 December 2019. Archived from the original(PDF) on 19 December 2019. Retrieved 25 January 2020.