Religious Landscape of Europe edited by Knippenberg, published by Het Spinhuis, Amsterdam 2005 ISBN 90-5589-248-3, pages 102-104 "Wat maakt Nederland tot Nederland
Religious Landscape of Europe" edited by Knippenberg published by Het Spinhuis, Amsterdam 2005 ISBN 978-90-5589-248-8, pages 102–104 "How many Jews live in
Religious Landscape of Europe" edited by Knippenberg published by Het Spinhuis, Amsterdam 2005 ISBN 90-5589-248-3, pages 7-9 Zurlo, Gina; Skirbekk, Vegard;
Knippenberg, "The Changing Religious Landscape of Europe", Het Spinhuis, Amsterdam 2005 ISBN 90-5589-248-3 "Religieuze betrokkenheid; persoonskenmerken"