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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 2015-09-24. Retrieved 10 February 2013.
"2013 年 3 月 16 日(土)ダイヤ改正を実施します" [A revision to train operations to be enforced on March 16, 2013 (Sat)] (PDF). Archived from the original(PDF) on February 28, 2013. Retrieved August 11, 2013.
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"西武鉄道「サステナ車両」東急電鉄9000系&小田急電鉄8000形を譲受" [Seibu receives Tokyu 9000 series and Odakyu 8000 series as sustainer vehicles]. Japan Railfan Magazine Online (in Japanese). Koyusha.Co.Ltd. 26 September 2023. Archived from the original on 2023-09-26. Retrieved 24 November 2023.