RUIG, R. de. Mr. H.P.G. Quack. De ongebroken kracht van de illusie. BMGN - Low Countries Historical Review, [S. l.], v. 98, n. 2, p. 191–211, 1983. DOI: 10.18352/bmgn-lchr.2392. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102589. Acesso em: 8 may. 2024.