Tourism trends from Europe to other regions of the world : 1980-1990 / World Tourism Organization
Tourism Market Trends: Europe / World Tourism Organization
Evolucion del turismo a nivel mundial 1950-1991 / Organizacion Mundial del Turismo
Resort hotel landscape as an international megatrend / Hana Ayala
Impact of the gulf crisis on international tourism : WTO special report / Organisation Mondiale du Tourisme