Spörel, U., & Täube, V. (2008). Tourism trends in Europe and in Mediterranean Partner Countries, 2000-2006. Statistics in focus: Industry, trade and services.
Chicago-Zitierstil (17. Ausg.)Spörel, Ulrich, 与 Volker Täube. "Tourism Trends in Europe and in Mediterranean Partner Countries, 2000-2006." Statistics in Focus: Industry, Trade and Services 2008.
MLA-Zitierstil (8. Ausg.)Spörel, Ulrich, 与 Volker Täube. "Tourism Trends in Europe and in Mediterranean Partner Countries, 2000-2006." Statistics in Focus: Industry, Trade and Services, 2008.
警告：这些引文格式不一定是100％准确.