「上野東京ライン」開業により、 南北の大動脈が動き出します [North-south artery comes into operation with opening of Ueno-Tokyo Line] (PDF). News release (in Japanese). Japan: East Japan Railway Company. 30 October 2014. Retrieved 30 October 2014.
2012年3月ダイヤ改正について [March 2012 Timetable Revision] (PDF) (in Japanese). Japan: East Japan Railway Company. 16 December 2011. Retrieved 16 December 2011.
jrmito.com
常磐線特急ひたち号の編成変更について [Changes to Joban Line Hitachi limited express formations] (PDF). News Release (in Japanese). Japan: East Japan Railway Company - Mito Division. 8 August 2013. Archived from the original(PDF) on 3 September 2013. Retrieved 8 August 2013.
railf.jp
"JR東日本,3月18日にダイヤ改正を実施" [JR East Implements Schedule Revision Effective 18 December 2022]. Japan Railfan Magazine Online (in Japanese). 16 December 2022. Archived from the original on 19 December 2022. Retrieved 11 November 2023.
web.archive.org
"JR東日本,3月18日にダイヤ改正を実施" [JR East Implements Schedule Revision Effective 18 December 2022]. Japan Railfan Magazine Online (in Japanese). 16 December 2022. Archived from the original on 19 December 2022. Retrieved 11 November 2023.
常磐線特急ひたち号の編成変更について [Changes to Joban Line Hitachi limited express formations] (PDF). News Release (in Japanese). Japan: East Japan Railway Company - Mito Division. 8 August 2013. Archived from the original(PDF) on 3 September 2013. Retrieved 8 August 2013.