WALS, H. J.W. Stutje, De man die de weg wees. Leven en werk van Paul de Groot 1899-1986. BMGN - Low Countries Historical Review, [S. l.], v. 116, n. 4, p. 556–560, 2001. DOI: 10.18352/bmgn-lchr.5597. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-106426. Acesso em: 5 feb. 2023.