International Conference on Senior Tourism & World Tourism Organization. (1997). Second International Conference on Senior Tourism, Recife: Proceedings, selected materials. World Tourism Organization.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Conference on Senior Tourism και World Tourism Organization. Second International Conference on Senior Tourism, Recife: Proceedings, Selected Materials. Madrid: World Tourism Organization, 1997.
Παραπομπή σε μορφή MLA (9th εκδ.)International Conference on Senior Tourism και World Tourism Organization. Second International Conference on Senior Tourism, Recife: Proceedings, Selected Materials. World Tourism Organization, 1997.
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