東急5050系が西武鉄道池袋線で営業運転開始 [Tokyu 5050 series enters service on the Seibu Ikebukuro Line]. RM News (in Japanese). Japan: Neko Publishing. 10 September 2012. Retrieved 10 September 2012.
seibu-group.co.jp
西武線全駅で駅ナンバリングを導入します [Station numbering to be introduced at all Seibu stations] (PDF). News Release (in Japanese). Japan: Seibu Railway. 23 February 2012. Archived from the original(PDF) on 24 September 2015. Retrieved 27 March 2013.
trafficnews.jp
"東京メトロ有楽町線が西武池袋線に乗り入れ開始した日 -1998.3.26" [On this day in 1998, through operation between the Tokyo Metro Yurakucho Line and Seibu Yurakucho Line begins]. trafficnews.jp (in Japanese). 26 March 2022. Retrieved 27 March 2022.
web.archive.org
西武線全駅で駅ナンバリングを導入します [Station numbering to be introduced at all Seibu stations] (PDF). News Release (in Japanese). Japan: Seibu Railway. 23 February 2012. Archived from the original(PDF) on 24 September 2015. Retrieved 27 March 2013.
