小村神社と国宝・金銅荘環頭大刀 [Omura Shrine and the national treasure: gilt bronze tachi with ring pommel] (in Japanese). Hidaka Board of Education. Retrieved July 3, 2011.
vill.hidaka.kochi.jp
日高村文化財 国宝 [Hidaka Cultural Properties, National Treasure] (in Japanese). Hidaka city. Archived from the original on 2011-07-19. Retrieved 2009-06-04.
web.archive.org
日高村文化財 国宝 [Hidaka Cultural Properties, National Treasure] (in Japanese). Hidaka city. Archived from the original on 2011-07-19. Retrieved 2009-06-04.