"人気キャラクターの原点にしてベルトスクロールアクションの始祖「熱血硬派くにおくん」" [The origin of the popular character, the founder of the belt scroll action "Kunio-kun"]. IGCC (in Japanese). Institute of Game Culture Convervation. April 25, 2019. Retrieved May 8, 2021.
"Best Hit Games 25"(PDF). Game Machine (in Japanese). No. 287. Amusement Press, Inc. July 15, 1986. p. 29.
"Game Machine's Best Hit Games 25: '86 下半期" [Game Machine's Best Hit Games 25: Second Half '86] (PDF). Game Machine (in Japanese). No. 300. Amusement Press, Inc. January 15, 1987. p. 16.