@inbook {Soenen 1976, title = {Chartreuse de Zelem}, booktitle = {Monasticon Belge, dl. 6: Province de Limbourg}, year = {1976}, note = {Elektronisch raadpleegbaar.}, pages = {293-334}, address = {Li{\`e}ge}, keywords = {Zelem O.Cart. (monasticon)}, author = {Micheline Soenen} }