Baldwin, John T. “To the Editor, Annales Universitatis Paedagogicae Cracoviensis”. Annales Universitatis Paedagogicae Cracoviensis | Studia ad Didacticam Mathematicae Pertinentia 11 (December 5, 2019): 179–180. Accessed April 29, 2024. https://didacticammath.uken.krakow.pl/article/view/6915.