Karp, Karen S., et al. “12 Math Rules That Expire in the Middle Grades”. Mathematics Teaching in the Middle School, vol. 21, no. 4, 2015, pp. 208-15, https://doi.org/10.5951/mathteacmiddscho.21.4.0208.
Karp, K. S., Bush, S. B., & Dougherty, B. J. (2015). 12 Math Rules That Expire in the Middle Grades. Mathematics Teaching in the Middle School, 21(4), 208-215. https://doi.org/10.5951/mathteacmiddscho.21.4.0208
Karp, Karen S., Sarah B. Bush, and Barbara J. Dougherty. “12 Math Rules That Expire in the Middle Grades”. Mathematics Teaching in the Middle School 21, no. 4 (2015): 208-15. https://doi.org/10.5951/mathteacmiddscho.21.4.0208.
Karp KS, Bush SB, Dougherty BJ. 12 Math Rules That Expire in the Middle Grades. Mathematics Teaching in the Middle School. 2015;21(4):208-15.