Glasnović Gracin, Dubravka, and Predrag Vuković. “The Requirements in Statistics Education – Comparison of PISA Mathematical Tasks and Tasks from the Mathematical Textbooks in the Field of Statistics”. Teaching Mathematics and Computer Science, vol. 8, no. 2, Dec. 2010, pp. 263-75, https://doi.org/10.5485/TMCS.2010.0262.