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.
Style de citation Chicago (17e éd.)International Hotel Association, International Hotels Environment Initiave, et United Nations Environment Programme (Francia). [Environmental Action Pack for Hotels: Practical Steps to Benefit Your Business and the Environment. Paris: UNEP, 1995.
Style de citation MLA (8e éd.)International Hotel Association, et al. [Environmental Action Pack for Hotels: Practical Steps to Benefit Your Business and the Environment. UNEP, 1995.
Attention : ces citations peuvent ne pas être correctes à 100%.