United States. Department of the Interior & United States. Servicio de Parques Nacionales. (1993). Guiding principles of sustainable design. National Park Service.
Style de citation Chicago (17e éd.)United States. Department of the Interior et United States. Servicio de Parques Nacionales. Guiding Principles of Sustainable Design. Denver, United States: National Park Service, 1993.
Style de citation MLA (8e éd.)United States. Department of the Interior et United States. Servicio de Parques Nacionales. Guiding Principles of Sustainable Design. National Park Service, 1993.
Attention : ces citations peuvent ne pas être correctes à 100%.