World Conference on Tourism Communications & World Tourism Organization. (2004). Observations on international tourism communications: First world conference on tourism communications : Madrid, Spain 29-30 January 2004. World Tourism Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)World Conference on Tourism Communications και World Tourism Organization. Observations on International Tourism Communications: First World Conference on Tourism Communications : Madrid, Spain 29-30 January 2004. Madrid, Spain: World Tourism Organization, 2004.
Παραπομπή σε μορφή MLA (9th εκδ.)World Conference on Tourism Communications και World Tourism Organization. Observations on International Tourism Communications: First World Conference on Tourism Communications : Madrid, Spain 29-30 January 2004. World Tourism Organization, 2004.