1. Abell, S. K., Lannin, J. K., Marra, R. M., Ehlert, M. W., Cole, J. S., Lee, M. H., Park Roger, M. A., & Wang, C. Y. (2007). Multi-site evaluation of science and mathematics teacher professional development programs: The project profile approach. Studies in Educational Evaluation, 33(2), 135-158. https://doi.org/10.1016/j.stueduc.2007.04.003
2. Andrews, T., & Klease, G. (1998). Challenges of multisite video conferencing: The development of an alternative teaching/learning model. Australasian Journal of Educational Technology, 14(2), 88-97. https://doi.org/10.14742/ajet.1902
3. Association for Middle Level Education. (2010). This we believe: Keys to educating young adolescents. Westerville, OH: National Middle School Association.
4. Ball, D. L., & Bass, H. (2009). With an eye on the mathematical horizon: Knowing mathematics for teaching to learners’ mathematical futures. Paper presented at the 43rd JahrestagungfürDidaktik der Mathematik. Retrieved from http://www.mathematik.tudortmund.de/ieem/cms/media/BzMU/BzMU2009/Beitraege/Hauptvortraege/BALL_Deborah_BASS_Hyman_2009_Horizon.pdf
5. Ball, D. L., Thames, M. H., & Phelps, G. (2008). Content knowledge for teaching: What makes it special? Journal of Teacher Education, 59(5), 389-407. https://doi.org/10.1177/0022487108324554