Παραπομπή APA
World Tourism Organization. (1997). Second international conference on senior tourism, Recife/Olinda, State f Pernambuco, Brazil, 12-15 September 1996: Proceedings, selected materials. Madrid, Spain: World Tourism Organization.
Παραπομπή Chicago StyleWorld Tourism Organization. Second International Conference On Senior Tourism, Recife/Olinda, State F Pernambuco, Brazil, 12-15 September 1996: Proceedings, Selected Materials. Madrid, Spain: World Tourism Organization, 1997.
Παραπομπή MLAWorld Tourism Organization. Second International Conference On Senior Tourism, Recife/Olinda, State F Pernambuco, Brazil, 12-15 September 1996: Proceedings, Selected Materials. Madrid, Spain: World Tourism Organization, 1997.
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