Whitacre, I., Azuz, B., Lamb, L. L. C., Bishop, J. P., Schappelle, B. P., & Philipp, R. A. (2017). Integer comparisons across the grades: Students' justifications and ways of reasoning. The Journal Of Mathematical Behavior. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_scholarship_submission_1533933513_1f7fc6a8