La Gazette Officielle du Thermalisme / Office des Nouvelles Internationales
International business travel 1988 / by Robert Cleverdon & Kevin O'Brien
L'industrie hoteliere française / Horwath & Horwath France
La industria hotelera en cifras : México 1988 / Castillo Miranda Maldonado
International tourism forecasts to 1999 / by Anthony Edwards
O turismo : realidades e perspectivas / Licínio Cunha