World Tourism Organization. General Assembly & World Tourism Organization. (1993). Round table on planning for sustainable tourism development: World Tourism Organization, 10th General Assembly, Bali, Indonesia, 20 September - 9 October 1993. World Tourism Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)World Tourism Organization. General Assembly και World Tourism Organization. Round Table on Planning for Sustainable Tourism Development: World Tourism Organization, 10th General Assembly, Bali, Indonesia, 20 September - 9 October 1993. [s.l.]: World Tourism Organization, 1993.
Παραπομπή σε μορφή MLA (9th εκδ.)World Tourism Organization. General Assembly και World Tourism Organization. Round Table on Planning for Sustainable Tourism Development: World Tourism Organization, 10th General Assembly, Bali, Indonesia, 20 September - 9 October 1993. World Tourism Organization, 1993.