TOLBOOM, H.-J.; DUBELAAR, C. Avendersteen in Nederland. Bulletin KNOB, [S. l.], v. 108, n. 5-6, p. 173–182, 2009. DOI: 10.7480/knob.108.2009.5-6.164. Disponível em: https://bulletin.knob.nl/index.php/knob/article/view/Dubelaar173. Acesso em: 3 mei. 2024.