The future of National Tourism Offices & World Tourism Organization. (1999). The future of national tourism offices, Prague, Czech Republic, 27 May 1999 =: L'avenir des organisations nationales du tourisme, Prague (Republique tcheque), 27 mai 1999. World Tourism Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)The future of National Tourism Offices και World Tourism Organization. The Future of National Tourism Offices, Prague, Czech Republic, 27 May 1999 =: L'avenir Des Organisations Nationales Du Tourisme, Prague (Republique Tcheque), 27 Mai 1999. Madrid: World Tourism Organization, 1999.
Παραπομπή σε μορφή MLA (9th εκδ.)The future of National Tourism Offices και World Tourism Organization. The Future of National Tourism Offices, Prague, Czech Republic, 27 May 1999 =: L'avenir Des Organisations Nationales Du Tourisme, Prague (Republique Tcheque), 27 Mai 1999. World Tourism Organization, 1999.