Journal article (2008) - K Bijsterveld (author), W Leeuwen (author), J van Schooten (author), F van Loon (author), R van Schendelen (author), T van Hoek (author), F de Zeeuw (author), H. Priemus (author), JJ de Graaf (author), R Goes (author), S Korthuis (author), R Paping (author), F van Blokland (author), G Hukker (author), P Noordanus (author), E Brinkman (author)

Journal article (2008) - Fred Hobma (author), M. Spaans (author), F de Zeeuw (author)