Portugal Country Risk Report [Q1; Q2; Q3; Q4/ 2017 Q1/2018] : Includes 10-year forecasts to 2025 / BMI Research
Diagnóstico das Estatísticas do Turismo : Identificação de Novas Necessidades de Informação Estatística
Tourism's contribution to the Yugoslav economy / Mia Mikic
The leakage of foreign exchange earnings from tourism / Christine Smith, Paul Jenner