VERMIJ, Rienk. Tussen liefhebbers en professionals. Het "groene tijdschrift", 1978-2007. Studium, Amsterdam, v. 12, n. 4, p. 218–225, 2019. DOI: 10.18352/studium.10207. Disponível em: https://platform.openjournals.nl/studium/article/view/21939.. Acesso em: 10 dec. 2025.