平成25 年3 月16 日(土) 東京の地下鉄がさらに便利になります [Tokyo Subway to become even more convenient from 16 March 2013] (PDF). News release (in Japanese). Japan: Tokyo Metro & Toei Subway. 15 February 2013. Retrieved 16 February 2013.
"2015年ニュースリリース|東京メトロ" [Departure melodies introduced to the Tozai Line!]. www.tokyometro.jp. 25 March 2015. Retrieved 12 June 2021.
"「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.