KOLFF, D. L. Hansen, W.E. Krul, A. van der Lem, Briefwisseling, I, 1894-1924, L. Hansen, W. E. Krul, A. van der Lem, ed. BMGN - Low Countries Historical Review, [S. l.], v. 107, n. 1, p. 151–153, 1992. DOI: 10.18352/bmgn-lchr.3491. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-103975. Acesso em: 4 may. 2024.