市内鉄道の年間乗降客数 [Annual number of passengers on the city rail] (in Japanese). Japan: Kiryū City. 2020. Retrieved 2 August 2020. (in Japanese)
tobu.co.jp
「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. Archived from the original(pdf) on 2012-08-08. Retrieved 22 October 2013.
watetsu.com
"沿革・歴史" [Company History]. watetsu.com (in Japanese). Archived from the original on 7 December 2023. Retrieved 9 February 2024.
web.archive.org
"沿革・歴史" [Company History]. watetsu.com (in Japanese). Archived from the original on 7 December 2023. Retrieved 9 February 2024.
「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. Archived from the original(pdf) on 2012-08-08. Retrieved 22 October 2013.