Le marché allemand de l'écotourisme / Organisation Mondiale du Tourisme
Sustainable development of ecotourism : a compilation of good practices / World Tourism Organization
The German ecotourism market / World Tourism Organization
Mercados emisores de turismo : visión general y análisis de las características de los países / Organización Mundial del Turismo
Tourist safety and security : practical measures for destinations / World Tourism Organization
Shining in the media spotlight : a communications handbook for tourism professionals / World Tourism Organization
Seminar on tourism statistics in the countries of central and eastern Europe, Prague, 28-30 Jan. 1992 / org. World Tourism Organization
Evolution du tourisme a l'echelle mondiale et en Europe 1980-1992 / org. Organisation Mondiale du tourisme