VELEMA, W. F. Bulhof, Ma patrie est au ciel. Leven en werk van Willem Emmery de Perponcher Sedlnitzky (1741-1819). BMGN - Low Countries Historical Review, [S. l.], v. 110, n. 1, p. 121–122, 1995. DOI: 10.18352/bmgn-lchr.3973. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-104570. Acesso em: 26 apr. 2024.