"京成電鉄「成田スカイアクセス」開業にともない7月17日にダイヤ改正を実施" [Timetable Revisions to take place on Keisei Railway on 17 July for Opening of the Narita Airport Line]. Japan Railfan Magazine Online (in Japanese). 28 May 2010. Archived from the original on 3 February 2023. Retrieved 31 January 2024.
"京成電鉄「成田スカイアクセス」開業にともない7月17日にダイヤ改正を実施" [Timetable Revisions to take place on Keisei Railway on 17 July for Opening of the Narita Airport Line]. Japan Railfan Magazine Online (in Japanese). 28 May 2010. Archived from the original on 3 February 2023. Retrieved 31 January 2024.