JANSEN, H. In memoriam dr. H. Zwager (1926-1973). BMGN - Low Countries Historical Review, [S. l.], v. 90, n. 1, p. 83–85, 1975. DOI: 10.18352/bmgn-lchr.1855. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107748. Acesso em: 5 may. 2024.