HOOIJMAAIJERS, Hans. Het planetarium van Hartog van Laun. Studium, Amsterdam, v. 2, n. 4, p. 214–222, 2009. DOI: 10.18352/studium.1485. Disponível em: https://platform.openjournals.nl/studium/article/view/20528.. Acesso em: 23 dec. 2024.