Yamaoka, Shigeyuki; Omura, Masao; Ukiya, Shuichi (2009). "血液型性格判断の差別性と虚妄性(自主企画(2))" [The discriminatory and false nature of blood type personality judgments (self-organized project (2))]. Proceedings of the Japanese Society of Personality Psychology. 18: 11. doi:10.24534/amjspp.18.0_11. Retrieved 1 July 2025.
Yamaoka, Shigeyuki; Omura, Masao; Ukiya, Shuichi (2009). "血液型性格判断の差別性と虚妄性(自主企画(2))" [The discriminatory and false nature of blood type personality judgments (self-organized project (2))]. Proceedings of the Japanese Society of Personality Psychology. 18: 11. doi:10.24534/amjspp.18.0_11. Retrieved 1 July 2025.