1. Aygün, Ö. (2018). A scale of Turkish preparatory school university students' demotivational factors towards learning English (Doctoral dissertation, Anadolu University (Turkey). Retrieve from: https://toad.halileksi.net/sites/default/files/pdf/hazirlik-sinifinda-okuyan-turk-ogrencilerin-ingilizce-ogrenme-motivasyonlarini-azaltan-unsurlar.pdf
2. Bar-On, R. (1997). BarOn emotional quotient inventory. Multi-Health Systems.
3. Bar-On, R., & Handley, R. (1999). Optimizing people: A practical guide for applying emotional intelligence to improve personal and organizational effectiveness. Pro-Philes Press.
4. Bar-On, R. (1997a). The Emotional Quotient Inventory (EQ-i): A test of emotional intelligence. Multi-Health Systems.
5. Brown, H. D. (2000). Principles of language learning and teaching (vol. 4). Longman.