van Dartel, Geert (18 December 2016). "In memoriam Hebe Kohlbrugge (1914–2016)" (in Dutch). Katholieke Vereniging voor Oecumene. Archived from the original on 19 October 2021. Retrieved 5 October 2022.
van Dartel, Geert (18 December 2016). "In memoriam Hebe Kohlbrugge (1914–2016)" (in Dutch). Katholieke Vereniging voor Oecumene. Archived from the original on 19 October 2021. Retrieved 5 October 2022.