Jeunes voyageurs au départ d'Allemagne, de Grande-Bretagne et de France / Organisation Mondiale du Tourisme
Estudo sobre o alojamento não-classificado no Algarve 1991-1997: relatório síntese / Universidade do Algarve. Unidade de Ciências Económicas e Empresariais
Youth outbound travel of the germans, the british and the french / World Tourism Organization
Enhancing the economic benefits of tourism for local communities and poverty alleviation / World Tourism Organization
Le marché canadien de l'écotourisme / Organisation Mondiale du Tourisme. Section des Études de Marché et Techniques de promotion, Section du Développement Durable du Tourisme
Outbound tourism of Scandinavia market profile / World Tourism Organization. Market Intelligence and Promotion Section