特急〈日光〉〈きぬがわ〉に253系リニューアル車投入へ [Refurbished 253 series to be introduced on "Nikko" and "Kinugawa" limited expresses]. Tetsudo Hobidas (in Japanese). Japan: Neko Publishing. 17 November 2010. Archived from the original on 19 November 2010. Retrieved 17 November 2010.
新型特急車両の導入について [Introduction of new limited express trains]. nagaden-net.co.jp (in Japanese). Nagano Electric Railway. 3 June 2010. Archived from the original on 30 March 2010. Retrieved 3 June 2010.
railf.jp
"253系1000番台OM-N01編成が試運転" [253-1000 series set OM-N01 undergoing test-running]. Japan Railfan Magazine Online (in Japanese). Japan: Koyusha Co., Ltd. 22 May 2011. Retrieved 23 May 2011.
特急〈日光〉〈きぬがわ〉に253系リニューアル車投入へ [Refurbished 253 series to be introduced on "Nikko" and "Kinugawa" limited expresses]. Tetsudo Hobidas (in Japanese). Japan: Neko Publishing. 17 November 2010. Archived from the original on 19 November 2010. Retrieved 17 November 2010.
新型特急車両の導入について [Introduction of new limited express trains]. nagaden-net.co.jp (in Japanese). Nagano Electric Railway. 3 June 2010. Archived from the original on 30 March 2010. Retrieved 3 June 2010.