Portugal Country Risk Report [Q1; Q2; Q3; Q4/ 2017 Q1/2018] : Includes 10-year forecasts to 2025 / BMI Research
Hierarquização das estâncias termais portuguesas / Licínio Cunha
U.S. tourist destinations : a history of desirability / Sam A. Lollar, Carlton S. Van Doren
Viaje al Madrid de la cultura / Luis Carandell Robuste