HELMERS, Helmer. Ole Peter Grell. Brethren in Christ. A Calvinist Network in Reformation Europe. De zeventiende eeuw, Amsterdam, v. 29, n. 1, p. 128, 2013. Disponível em: https://platform.openjournals.nl/de-zeventiende-eeuw/article/view/26797.. Acesso em: 20 mar. 2026.