ERTEL, Suitbert. Psi in a Skeptic’s Lab: A Successful Replication of Ertel’s Ball Selection Test. Journal of Scientific Exploration, [S. l.], v. 24, n. 4, 2010. Disponível em: https://journalofscientificexploration.org/index.php/jse/article/view/8. Acesso em: 9 may. 2026.