Organización Mundial del Turismo. (1999). Changes in leisure time: The impact on tourism / [World Tourism Organization]. World Tourism Organization.
Cita Chicago Style (17a ed.)Organización Mundial del Turismo. Changes in Leisure Time: The Impact on Tourism / [World Tourism Organization]. Madrid: World Tourism Organization, 1999.
Cita MLA (8a ed.)Organización Mundial del Turismo. Changes in Leisure Time: The Impact on Tourism / [World Tourism Organization]. World Tourism Organization, 1999.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.