"「営団地下鉄」から「東京メトロ」へ" [From "Teito Rapid Transit Authority" to "Tokyo Metro"]. Tokyo Metro Online. 8 July 2006. Archived from the original on 16 May 2012. Retrieved 29 May 2022.
"~神奈川県央地域及び横浜市西部から東京・埼玉に至る広域的な鉄道ネットワークの形成~" [-Formation of a wide-area railway network from central Kanagawa Prefecture and western Yokohama to Tokyo and Saitama-] (PDF). tokyometro.jp. 27 January 2022. Archived from the original(PDF) on 27 January 2022. Retrieved 22 March 2023.
web.archive.org
"「営団地下鉄」から「東京メトロ」へ" [From "Teito Rapid Transit Authority" to "Tokyo Metro"]. Tokyo Metro Online. 8 July 2006. Archived from the original on 16 May 2012. Retrieved 29 May 2022.
"~神奈川県央地域及び横浜市西部から東京・埼玉に至る広域的な鉄道ネットワークの形成~" [-Formation of a wide-area railway network from central Kanagawa Prefecture and western Yokohama to Tokyo and Saitama-] (PDF). tokyometro.jp. 27 January 2022. Archived from the original(PDF) on 27 January 2022. Retrieved 22 March 2023.