Titsingh, p. 342, p. 342, ที่ Google Books; Screech, Timon. (2006). Secret Memoirs of the Shoguns: Isaac Titsingh and Japan, 1779–1822, p. 234 n.10; n.b., Yoshikatsu (b. 1434 – d. 1443) = 8yrs. In this period, "children were considered one year old at birth and became two the following New Year's Day; and all people advanced a year that day, not on their actual birthday."
