WTO/CEU-ETC Joint Seminar Salzburg, Austria, & World Tourism Organization. (1997). Faced with worldwide competition and structural changes: What are the tourism responsibilities of European governments? : WTO. World Tourism Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)WTO/CEU-ETC Joint Seminar Salzburg, Austria, και World Tourism Organization. Faced with Worldwide Competition and Structural Changes: What Are the Tourism Responsibilities of European Governments? : WTO. Madrid, Spain: World Tourism Organization, 1997.
Παραπομπή σε μορφή MLA (9th εκδ.)WTO/CEU-ETC Joint Seminar Salzburg, Austria, και World Tourism Organization. Faced with Worldwide Competition and Structural Changes: What Are the Tourism Responsibilities of European Governments? : WTO. World Tourism Organization, 1997.