1. The functional economy: cultural change and organizational change;Stahel,1997
2. Goedkoop M, van Halen C, te Riele H, Rommes P. Product services systems, ecological and economic basics, report 1999/36. VROM, the Hague; 1999.
3. Mejcamp R. Changing consumer behavior through eco-efficient services. Delft: Delft University of Technology; 2000.
4. Manzini E, Vezzoli C. Product–service systems and sustainability. Opportunities for sustainable solutions. United Nations Environment Programme, Division of Technology Industry and Economics, Production and Consumption Branch, CIR.IS Politecnco di Milano, ISBN: 92-807-2206-9, Milan; 2002.
5. Sustainability and services;Stahel,2001