1. Alcine, E. (2019). Teachers' Perceptions of Academic Performance and Student Engagement Among Ninth-Grade Students. Unpublished Doctoral Dissertation. Walden University, United States. https://scholarworks.waldenu.edu/dissertations/6390/
2. Aktaş, N. (2016). Lise Öğrencilerinin Motivasyon Kaynakları ve Karar Verme Stratejileri. [Motivation Sources of High School Students and Decision-Making Strategies]. Unpublished Master’s Thesis. Adnan Menderes University Institute of Social Sciences, Aydın.
3. Astin, A. W. (1991). Assessment for excellence: The philosophy and practice of assessment and evaluation in higher education. New York: MacMillian.
4. Asmus, E. P. (1986). Student beliefs about the causes of success and failure in music: A study of achievement motivation. Journal of Research in Music Education, 34, 262–278. DOI: 10.2307/3345260.
5. Baltacı, A. (2018). Nitel Araştırmalarda Örnekleme Yöntemleri ve Örnek Hacmi Sorunsalı Üzerine Kavramsal Bir İnceleme. [A Conceptual Review of Sampling Methods and Sample Size Problems in Qualitative Research]. Journal of Bitlis Eren University Institute of Social Sciences. 7(1), 231-274. https://dergipark.org.tr/tr/download/article-file/497090