Os portugueses e a Expo'98 / Direcção-Geral do Turismo
Tourism and recreation handbook of planning and design / Manuel Baud-Bovy and Fred Lawson
The heritage monitor : a yearly anaysis of trends affecting England's architectural heritage - a vital tourism asset / English Tourism Council
Tourism satellite account (TSA) / World Tourism Organization
Destination threshold potential and the law of repeat visitation / Martin Oppermann
Os Portugueses e a EXPO/98