J.S. Calff, Van pionier tot mammoet. Het Amsterdamse Montessori Lyceum, 1930-1980. BMGN - Low Countries Historical Review, [S. l.], v. 98, n. 2, p. 258–260, 1983. DOI: 10.18352/bmgn-lchr.2407. Disponível em: https://bmgn-lchr.nl/article/view/URN%3ANBN%3ANL%3AUI%3A10-1-102605.. Acesso em: 18 jul. 2024.