Sonsbeek 71: Sonsbeek buiten de perken (2 vols.)

vol 1.
Sanders, P (Chairman of Sonsbeek 71 Foundation), ‘Sonsbeek 71 – an adventure’, pp. 5-6
Beeren, WAL, ‘From exhibition to activity’, pp. 7-13

vol. 2
Beeren, WAL, ‘During the ride’, pp. 2-3