HOMBURG, Ernst. In Memoriam Johannes Willem (’Hans’) van Spronsen (1928-2009/2010). Studium, Amsterdam, v. 5, n. 2, p. 128–133, 2012. DOI: 10.18352/studium.8196. Disponível em: https://platform.openjournals.nl/studium/article/view/20289.. Acesso em: 23 dec. 2024.