E. Dubinsky, On learning quantifications, Journal of Computers in Mathematics and Science Teaching16 (1997) 335-362.
(Available in microfiche in Collier Library)\
J. Jenkins, J. A. Jerkins, C. Stenger, A plan for immediate immersion of computational thinking into the high school math classroom through a partnership with the Alabama Math, Science, and Technology Initiative. Proceedings of the 50th Annual Southeast Regional Conference, ACM-SE '12 (2012) 148—152. https://ezproxy.una.edu/login?url=http://doi.acm.org/10.1145/2184512.2184547
J. Piaget, Science of education and the psychology of the child. Orion Press, New York, 1970.
Collier Library: LB 775 .P48713
K. Weller, C. Stenger, E. Dubinsky, D. Vidakovic, Infinite iterative processes: The tennis ball problem, European Journal of Pure and Applied Mathematics1 (2007) 99-121. http://www.ejpam.com/index.php/ejpam/article/view/48/17