Czakon, Dominika, Natalia Anna Michna, i Leszek Sosnowski, red. 2020. „On the Difficult Academic and Personal Relationship of Roman Ingarden and Kazimierz Twardowski . 63”. W Roman Ingarden and His Times. Poland: Wydawnictwo Księgarnia Akademicka. https://doi.org/10.12797/9788381382106.04.