KOSTYŁO, Piotr. „Edukacja Dorosłych: Adult Education and Competencies. Approaches of Researchers in Poland and Germany”. Rocznik Andragogiczny, [S. l.], v. 21, p. 625–627, 2015. DOI: 10.12775/RA.2014.055. Disponível em: https://apcz.umk.pl/RA/article/view/RA.2014.055. Acesso em: 4 lip. 2025.