WELS, C. J.C. Boogman, Nederland, Europa en de wereld. Ons buitenlands beleid in discussie. BMGN - Low Countries Historical Review, [S. l.], v. 86, n. 2, p. 317–319, 1971. DOI: 10.18352/bmgn-lchr.1682. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-101839. Acesso em: 24 feb. 2024.