^東武20400形が営業運転を開始 [Tobu 20400 series begins commercial operation]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 4 September 2018. Retrieved 18 December 2022.
^Terada, Hirokazu (19 January 2013). データブック日本の私鉄 [Databook: Japan's Private Railways] (in Japanese). Japan: Neko Publishing. pp. 62–63. ISBN978-4-7770-1336-4.
^「東武スカイツリーライン」誕生! あわせて駅ナンバリングを導入し、よりわかりやすくご案内します [Tobu Sky Tree Line created! Station numbering to be introduced at same time] (pdf). Tobu News (in Japanese). Tobu Railway. 9 February 2012. Retrieved 26 May 2015.