1. Ministry of Foreign Affairs of Japan(2021a)Takeshima no Retto. Retrieved 2 May 2021 from websitehttps://mofa.go.jp/region/asia-pacifi/takeshima/index.html
2. Ministry of Foreign Affairs of Japan(2021b)Utsuryo e no tokai Kinshi. Retrieved 2 May 2021 from websitehttps://mofa.go.jp/a_o/na/takeshima/page1we_000059.html
3. ‘Takeshima’ Referred to ‘Ulleungdo’ in the 17th Century(2023) Retrieved 25 May 2023 from Websitehttp://contents.nahf.or.kr/english/item/level.do;JSESSIONID_NAHFHIS_WEB=5DB7CB32F82D63CC8CEEAE6FBD6E25C4?levelId=isdk.e_0001_0010_0030
4. Ten Issues of Takeshima(2021) Retrieved 5 May 2021 from Websitehttps://web.archive.org/web/20080913071653/http://www.mofa.go.jp/region/asia‐paci/takeshima/pamphlet_e.pdf