VAN ZYL, MS. John Calvin and Karl Barth – Free and obedient theologians. NGTT | Nederduitse Gereformeerde Teologiese Tydskrif, [S. l.], v. 50, n. 3&4, 2009. DOI: 10.17570/ngtt.2009.v50n3.a32. Disponível em: https://ojs.reformedjournals.co.za/index.php/ngtt/article/view/1102. Acesso em: 18 oct. 2025.