KRASZEWSKI, K. Emil Wettstein, Philipp Gonon, Berufsbildung in der Schweiz, hep verlag ag, Bern 2009, ss. 304, ISBN 978-3-03905-443-5. Journal of Education, Technology and Computer Science, [S. l.], v. 11, n. 1, p. 122–124, 2015. Disponível em: https://journals.ur.edu.pl/jetacomps/article/view/6534. Acesso em: 3 lis. 2024.