BASTEMEIJER, Aad. Order and Confusion. The Twelfth-Century Choir of the St. Servatius Church in Maastricht Utrecht. Bulletin KNOB, [S.l.], p. 44-45, juni 2019. ISSN 2589-3343. Beschikbaar op: <https://journals.open.tudelft.nl/index.php/knob/article/view/3852>. Datum gebruik: 05 dec. 2019 doi: https://doi.org/10.7480/knob.118.2019.2.3852.