VELDE, H. te. L. Dorsman, G. W. Kernkamp. Historicus en democraat, 1864-1943. BMGN - Low Countries Historical Review, [S. l.], v. 108, n. 2, p. 295–296, 1993. DOI: 10.18352/bmgn-lchr.3682. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104233. Acesso em: 7 aug. 2022.