1. Accor Group, 1998. The environment guide for hotel managers. Accor Group, Paris, France.
2. APAT (Italian National Agency for the Protection of the Environment and for Technical Services), 2002. Tourist accommodation EU eco-label award scheme – Final Report. Italian National Agency for the Protection of the Environment and for Technical Services, Rome, Italy.
3. Bergkvist, J.P., 2003. Personal communication with Jan-Peter Bergkvist, Director of Environmental Sustainability at Hilton International and Scandic. March 12, 2003, Stockholm, Sweden.
4. Hilton's environmental training campaign;Bergkvist;Green Hotelier,2004
5. Blank, D., 1999. Energy-saving efforts help hotels reduce maintenance and expenses. Hotel and Motel Management, November 1, 1999.