BIERMAN, Annette. Dirk Arnold Wittop Koning (1911–2001). Studium, Amsterdam, v. 6, n. 3-4, p. 304–306, 2013. DOI: 10.18352/studium.9297. Disponível em: https://platform.openjournals.nl/studium/article/view/20335.. Acesso em: 22 dec. 2024.