GOOR, J. van. W. Otterspeer, Leiden oriental connections 1850-1940. BMGN - Low Countries Historical Review, [S. l.], v. 110, n. 1, p. 137–140, 1995. DOI: 10.18352/bmgn-lchr.3983. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104582. Acesso em: 24 apr. 2024.