- Content knowledge for teachers: What makes it Special – Ball, Thames and Phelps, 2008
- Learning mathematics for Teaching: Results from California’s Mathematics Professional development Institutes – Hill, Ball
- Mathematical Knowledge for Teaching in Planning and Evaluating Instruction: What Can Preservice Teachers Learn? – Morris, Hiebert and Sptitzer, 2009
- What math knowledge does teaching require? – Thames and Ball, 2010
- Unpacking pedagogical content knowledge: Conceptualizing and measuring teachers; topic-specific knowledge of students. – Hill, Ball, Schilling, 2008
- Effect of Teachers mathematical knowledge on student achievement – Hill, Rowan, Ball, 2005
- The Effects of Different Undergraduate Mathematics Courses on the Content Knowledge and Attitude towards Mathematics of Preservice Elementary Teachers – Matthews and Seaman, 2007
- What Does Number Sense Look Like? – Melinda Crean, http://topnotchteaching.com/experts/guide-to-develop-number-sense/
- Developing Early Number Sense – Jenni Way, University of Cambridge
- Elementary and Middle School Mathematics. Van de Walle, John. Pearson Education, 2004