"栗山川 (Kuriyama-gawa)". Nihon Rekishi Chimei Taikei (日本歴史地名大系 (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-01.
"栗山川 (Kuriyama-gawa)". Nihon Daihyakka Zensho (Nipponika) (日本大百科全書(ニッポニカ) (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-04-30.
"Kurimoto". Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-20.
"Ryōsō Canal". Encyclopedia of Japan. Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-04-18.
"Iwayama-mura". Nihon Rekishi Chimei Taikei (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-20.
"Iizuka Iseki-gun". Nihon Rekishi Chimei Taikei (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-20.
"Kashiwakuma Kofun-gun". Nihon Rekishi Chimei Taikei (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-20.
"栗山川 (Kuriyama-gawa)". Nihon Rekishi Chimei Taikei (日本歴史地名大系 (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-01.
"栗山川 (Kuriyama-gawa)". Nihon Daihyakka Zensho (Nipponika) (日本大百科全書(ニッポニカ) (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-04-30.
"Kurimoto". Nihon Daihyakka Zensho (Nipponika) (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-20.
"Ryōsō Canal". Encyclopedia of Japan. Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-04-18.
"Iwayama-mura". Nihon Rekishi Chimei Taikei (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-20.
"Iizuka Iseki-gun". Nihon Rekishi Chimei Taikei (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-20.
"Kashiwakuma Kofun-gun". Nihon Rekishi Chimei Taikei (in Japanese). Tokyo: Shogakukan. 2012. Archived from the original on 2007-08-25. Retrieved 2012-05-20.
横芝光町の被災状況 (in Japanese). Chiba: Chiba Prefecture. Archived from the original on 2012-01-21. Retrieved 2012-05-30.