• Mainichi Shimbun. 13 January 2024. Retrieved 18 January 2024. "元前頭琴ケ嶽の竹内孝一さんが心不全で死去 71歳 在位99場所 引退後は高校球児の息子を応援" (in Japanese). Nikkan Sports. 26 February 2024...
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