International Hotel Association, International Hotels Environment Initiave, & United Nations Environment Programme (Francia). (1995). [Environmental action pack for hotels: Practical steps to benefit your business and the environment. UNEP.
Cita Chicago Style (17a ed.)International Hotel Association, International Hotels Environment Initiave, e United Nations Environment Programme (Francia). [Environmental Action Pack for Hotels: Practical Steps to Benefit Your Business and the Environment. Paris: UNEP, 1995.
Cita MLA (8a ed.)International Hotel Association, et al. [Environmental Action Pack for Hotels: Practical Steps to Benefit Your Business and the Environment. UNEP, 1995.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.