1. Daal, H. J. van, and E. M. T. Plemper: 2003, ‘Het geven van tijd: vrijwilligerswerk’ (Giving Time: Volunteer Work’), in Th. N. M. Schuyt (ed.), Geven in Nederland 2003: Giften, legaten, sponsoring en vrijwilligerswerk (Giving in the Netherlands 2003: Gifts, Legacies, Sponsoring and Volunteer Work (Houten/Mechelen, Bohn Stafleu Van Loghum), pp. 80–108
2. Career-oriented versus team-oriented commitment and behavior at work.