J. Hemels, De krant in bedrijf. 75 jaar samenwerking en samenleving. BMGN - Low Countries Historical Review, [S. l.], v. 100, n. 3, p. 490–491, 1985. DOI: 10.18352/bmgn-lchr.2642. Disponível em: https://ojstest.minions.amsterdam/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102867.. Acesso em: 22 dec. 2024.