Sharifi, Mohammad; Jeurissen, Maurice (2014). "In gesprek met: Willem Zwalve"(PDF). Novum Magazine (in Dutch). No. 5 (35 ed.). pp. 6–9. Archived from the original(PDF) on 22 December 2023.
Sharifi, Mohammad; Jeurissen, Maurice (2014). "In gesprek met: Willem Zwalve"(PDF). Novum Magazine (in Dutch). No. 5 (35 ed.). pp. 6–9. Archived from the original(PDF) on 22 December 2023.