1. ADEME, ARCS, CRES, ICAEN, IER, SOFTECH. 2001. Green Flag for Greener Hotels, Final Report LIFE ENV/00038/FR. http://europa.eu.int/comm/environment/ecolabel/pdf/tourism/lifefinalreport.pdf [3 September 2003].
2. An analysis of environmental management, organizational context and performance of Spanish hotels
3. 2003. Gestión Sostenible en la Industria Turística. Retórica y Práctica en el Sector Hotelero Español [Sustainable Management in the Tourism Industry. Rhetoric and Practice in the Spanish Hotel Sector], PhD thesis, Autonomous University of Barcelona. http://www.tdx.cesca.es/TDX-0621104-151345/ [1 October 2004].
4. . 2002. Turismo Sostenible [Sustainable Tourism]. Rubes: Barcelona.
5. Attitudes in the Danish tourism industry to the roles of business and government in sustainable tourism