1. Alcalá, M. (2002). La construcción del lenguaje matemático [The mathematical language construction]. Barcelona, Spain: Graó.
2. An, S., Kulm, G., & Wu, Z. (2004). The pedagogical content knowledge of middle school, mathematics teachers in China and the US. Journal of Mathematics Teacher Education, 7(2), 145–172.
3. Ball, D. (1990). The mathematical understandings that prospective teachers bring to teacher education. The Elementary School Journal, 90(4), 449–466.
4. Ball, D., & Bass, H. (2009). With an eye on the mathematical horizon: Knowing mathematics for teaching to learners’ mathematical futures. Paper presented at the 2009 Curtis Center Mathematics and Teaching Conference. Los Angeles, LA: University of California.
5. Invited Lectures;D Ball,2002