URBAŃCZYK, P. “Internal” Problems of Normative Theories of Thinking and Reasoning. Philosophical Problems in Science (Zagadnienia Filozoficzne w Nauce), [S. l.], n. 60, p. 35–52, 2016. Disponível em: https://zfn.edu.pl/index.php/zfn/article/view/366. Acesso em: 6 dec. 2022.