E. Mulder, Beginsel en beroep. Pedagogiek aan de universiteit in Nederland 1900-1940. BMGN - Low Countries Historical Review, [S. l.], v. 106, n. 2, p. 292–294, 1991. DOI: 10.18352/bmgn-lchr.3403. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103869.. Acesso em: 23 nov. 2024.