“ON PROBLEMS.” Measurement, by Paul Lockhart, Harvard University Press, Cambridge, Massachusetts; London, England, 2012, pp. 5–20, www.jstor.org/stable/j.ctt2jbt0k.4. Accessed 24 July 2021.
Lockhart, P. (2012). ON PROBLEMS. In Measurement (pp. 5-20). Cambridge, Massachusetts; London, England: Harvard University Press. Retrieved July 24, 2021, from http://www.jstor.org/stable/j.ctt2jbt0k.4
Lockhart, Paul. "ON PROBLEMS." In Measurement, 5-20. Cambridge, Massachusetts; London, England: Harvard University Press, 2012. Accessed July 24, 2021. http://www.jstor.org/stable/j.ctt2jbt0k.4.
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