BRANDS, M. In memoriam Dr. J. Haak 1924-1970. BMGN - Low Countries Historical Review, [S. l.], v. 85, n. 3, p. 359–360, 1970. DOI: 10.18352/bmgn-lchr.1629. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-107831. Acesso em: 8 may. 2024.