札幌市営地下鉄東豊線で9000形が営業運転を開始 [9000 series enters service on Sapporo Municipal Subway Toho Line]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 9 May 2015. Retrieved 9 May 2015.
"地下鉄(高速電車)の概要" [Overview of the subway (high-speed train)]. city.sapporo.jp (in Japanese). Archived from the original on 19 January 2024. Retrieved 6 February 2024.
札幌市. "乗車料金". 札幌市 (in Japanese). Retrieved 6 June 2023.
札幌市. "乗車券のご案内". 札幌市 (in Japanese). Retrieved 6 June 2023.
"地下鉄(高速電車)の概要" [Overview of the subway (high-speed train)]. city.sapporo.jp (in Japanese). Archived from the original on 19 January 2024. Retrieved 6 February 2024.