↑Toyota Masataka, 'Niten Ki (A Chronicle of Two Heavens)', Gorin no Sho, ed. Kamiko Tadashi (Tokyo: Tokuma-shoten, 1963), p. 239
↑Matt Doeden, Life as a Samurai: An Interactive History Adventure (Mankato, MN: Capstone Press, 2011), p. 76
↑Nick Evangelista, The Encyclopedia of the Sword (Westport, CT: Greenwood Press, 1995), p. 318
↑Kenji Tokitsu; Sherab Chodzin Kohn, Miyamoto Musashi: His Life and Writings (Boston: Shambhala: Distributed in the U.S. by Random House, 2004), p. 124
↑Leo Gough, Miyamoto Musashi's The Book of Five Rings: A modern-day interpretation of a military classic (Oxford, UK: Infinite Ideas, 2009), p. 8