Spörel, U., & Täube, V. (2008). Tourism trends in Europe and in Mediterranean Partner Countries, 2000-2006. Statistics in focus: Industry, trade and services.
Lua i Stíl Chicago (17ú heag.)Spörel, Ulrich, agus Volker Täube. "Tourism Trends in Europe and in Mediterranean Partner Countries, 2000-2006." Statistics in Focus: Industry, Trade and Services 2008.
Lua MLA (8ú heag.)Spörel, Ulrich, agus Volker Täube. "Tourism Trends in Europe and in Mediterranean Partner Countries, 2000-2006." Statistics in Focus: Industry, Trade and Services, 2008.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.