Motoki Kuroda (黒田基樹) (2023). "なぜ徳川家康は正妻と嫡男を自害させたのか…戦国時代にも存在した｢上司への忖度｣という悲劇" [Why did Ieyasu Tokugawa kill his wife and his legitimate son?]. President Online (in Japanese). President Inc. pp. 1–4. Retrieved 30 June 2024.
syakaika-turezure.com
"徳川家康の嫡男 【松平信康を切腹させたのは 誰か】" [Tokugawa Ieyasu's eldest son [Who forced Matsudaira Nobuyasu to commit seppuku?]]. 社会科関連徒然語り (in Japanese). 2023. Retrieved 16 July 2024.
