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Kazuhiro Marushima (丸島和洋) (2015). "北条・徳川間外交の意思伝達構造" [The structure of communication in diplomacy between the Hojo and Tokugawa]. 国文学研究資料館紀要. 11 (11). 国文学研究資料館: 33–52. doi:10.24619/00001469. ISSN1880-2249.