1. Critical factors for an effective and efficient multi-modal freight transport network in Europe;Bithas;Innovation,1997
2. Central Bureau for Statistics, 1994. Milieustatistieken 1994 [Environmental Statistics for the Netherlands 1994]. Central Bureau for Statistics, Voorburg/Heerlen
3. Central Planning Bureau, 1997. Economie en fysieke omgeving: Beleidsopgaven en oplossingsrichtingen [Economy and physical environment: Policy tasks and directions of solutions 1995–2020]. Central Planning Bureau. Sdu publishers, The Hague
4. Commission of the European Communities, 1992. The Future Development of the Common Transport Policy: a Global Approach to the Construction of a Community Framework for Sustainable Mobility. Commission of the European Communities, Brussels
5. Goederenvervoer en Milieu [Freight transport and environment];Janse;Milieuforum,1994