@book{155885,
	author = {World Tourism Organzation.},
	title = {Global distribution systems (GDSs) in the tourism industry},
	publisher = {World Tourism Organization},
	year = {1995.},
	series = {World tourism forecasting series.},
	address = {Madrid},
	note = {A study prepared for TWO by Oliver Vialle - 1994.}
}