Belnap, Kirk, Dan Dewey, Patrick Steffen, Annika Bickmore, and Khalil Yousef. “Heart Rate Variability and Personality Traits As Predictors of Arabic Language Proficiency and Gains During Study Abroad in Jordan”. Studies in Second Language Learning and Teaching 15, no. 4 (December 5, 2025): 857–884. Accessed December 9, 2025. https://pressto.amu.edu.pl/index.php/ssllt/article/view/49260.