Lawton, Carol A. “Contextual Factors Affecting Errors in Proportional Reasoning”. Journal for Research in Mathematics Education, vol. 24, no. 5, 1993, p. 460, https://doi.org/10.2307/749154.
Lawton, C. A. (1993). Contextual Factors Affecting Errors in Proportional Reasoning. Journal for Research in Mathematics Education, 24(5), 460. https://doi.org/10.2307/749154
Lawton, Carol A. “Contextual Factors Affecting Errors in Proportional Reasoning”. Journal for Research in Mathematics Education 24, no. 5 (1993): 460. https://doi.org/10.2307/749154.
Lawton CA. Contextual Factors Affecting Errors in Proportional Reasoning. Journal for Research in Mathematics Education. 1993;24(5):460.