APA (7th ed.) Citation

Yopp, D. A., Burroughs, E. A., & Lindaman, B. J. (2011). Why It Is Important for In-Service Elementary Mathematics Teachers to Understand the Equality 0.999...=1. Journal of Mathematical Behavior, 30(4), 304. https://doi.org/10.1016/j.jmathb.2011.07.007

Chicago Style (17th ed.) Citation

Yopp, David A., Elizabeth A. Burroughs, and Brian J. Lindaman. "Why It Is Important for In-Service Elementary Mathematics Teachers to Understand the Equality 0.999...=1." Journal of Mathematical Behavior 30, no. 4 (2011): 304. https://doi.org/10.1016/j.jmathb.2011.07.007.

MLA (9th ed.) Citation

Yopp, David A., et al. "Why It Is Important for In-Service Elementary Mathematics Teachers to Understand the Equality 0.999...=1." Journal of Mathematical Behavior, vol. 30, no. 4, 2011, p. 304, https://doi.org/10.1016/j.jmathb.2011.07.007.