"北斗(市)" [Hokuto]. Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. OCLC153301537. Archived from the original on 2007-08-25. Retrieved 2012-12-02.
"上磯" [Kamiiso]. Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. OCLC153301537. Archived from the original on 2007-08-25. Retrieved 2012-12-02.
"北斗(市)" [Hokuto]. Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. OCLC153301537. Archived from the original on 2007-08-25. Retrieved 2012-12-02.
"上磯" [Kamiiso]. Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. OCLC153301537. Archived from the original on 2007-08-25. Retrieved 2012-12-02.
worldcat.org
"北斗(市)" [Hokuto]. Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. OCLC153301537. Archived from the original on 2007-08-25. Retrieved 2012-12-02.
"上磯" [Kamiiso]. Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. OCLC153301537. Archived from the original on 2007-08-25. Retrieved 2012-12-02.