Buela, Mabel, et al. “Association of Ambiguity Tolerance and Problem-Solving Ability of Students in Mathematics”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 51, no. 1, Apr. 2020, pp. 12-24, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/11027.