1. Brown, H. D. (2007). Teaching by principles: An interactive approach
2. to Language Pedagogy. Pearson longman.
3. Brophy, J. (2004). Motivating students to learn: Routledge.
4. Cavallo, A. M., Rozman, M., Blickenstaff, J., & Walker, N. (2003). Learning, reasoning, motivation, and epistemological beliefs. Journal of College Science Teaching, 33(3), 18.
5. Chow, S. J., & Yong, B. C. S. (2013). Secondary school students' motivation and achievement in combined science. Online Submission, 3(4), 213-228.