"伊豆・小笠原諸島における 情報通信インフラ整備状況の調査" [Survey on improvement conditions of telecommunication infrastructures in Izu-Ogasawara Islands] (PDF). Kantō Bureau of Telecommunications. Archived from the original(PDF) on 24 October 2007. Retrieved 16 October 2008.
metro.tokyo.jp
ogasawara-h.metro.tokyo.jp
東京都立小笠原高等学校. www.ogasawara-h.metro.tokyo.jp (in Japanese).
"伊豆・小笠原諸島における 情報通信インフラ整備状況の調査" [Survey on improvement conditions of telecommunication infrastructures in Izu-Ogasawara Islands] (PDF). Kantō Bureau of Telecommunications. Archived from the original(PDF) on 24 October 2007. Retrieved 16 October 2008.