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Isao, Kumakura; McClintock, Martha J. (2023), "Front Matter", Japanese Tea Culture, The Heart and Form of Chanoyu, Japan Publishing Industry Foundation for Culture, pp. 1–4, doi:10.2307/jj.2840648.1, ISBN978-4-86658-246-7, retrieved 2024-04-26
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Tsuitsui Hiroichi. "Koicha". Japanese online encyclopedia of Japanese Culture (in Japanese). Archived from the original on 2016-03-23. Retrieved 2012-07-13.