Yusoff, Nasir, Nik NurAzhani Anuar, Wan Nor Arifin, Tahamina Begum, and Faruque Reza. “Emotional Arousal Substrate in Relation to Eysenck Theory of Extraversion”. International Journal of Engineering and Technology 7, no. 3.22 (August 8, 2018): 14–20. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/17115.