| Fies & Marshall, 2006Fies, C., & Marshall, J. (2006). Classroom response systems: A review of the literature. Journal of Science Education and Technology, 15(1), 101--109. | Fies, C., & Marshall, J. (2006). Classroom response systems: A review of the literature. Journal of Science Education and Technology, 15(1), 101–109. |
Simkins & Maier, 2008Simkins, S. P., & Maier, M. H. (2008). Learning from physics education research: Lessons for economics education. MPRA Paper. | Simkins, S. P., & Maier, M. H. (2008). Learning from physics education research: Lessons for economics education. MPRA Paper. |
| Bruff, 2009Bruff, D. (2009). Teaching with classroom response systems: Creating active learning environments. Jossey-Bass. | Bruff, D. (2009). Teaching with classroom response systems: Creating active learning environments. Jossey-Bass. |