Ricci Bitti, Pio E., Luisa Bonfiglioli, Paolo Melani, Roberto Caterina, and Pierluigi Garotti. 2014. “Expression and Communication of doubt/Uncertainty through Facial Expression”. Ricerche Di Pedagogia E Didattica. Journal of Theories and Research in Education 9 (1):159-77. https://doi.org/10.6092/issn.1970-2221/4296.