Chen, Ming-Jang, Chun-Yi Lee, and Wei-Chih Hsu. 2015. “Influence of Mathematical Representation and Mathematics Self-Efficacy on the Learning Effectiveness of Fifth Graders in Pattern Reasoning”. International Journal of Learning, Teaching and Educational Research 13 (1):1-16. http://www.ijlter.myres.net/index.php/ijlter/article/view/1038.