Παραπομπή APA

World Tourism Organization. (1995). Collection of tourism expenditure statistics. Madrid, Spain: World Tourism Organization.

Παραπομπή Chicago Style

World Tourism Organization. Collection of Tourism Expenditure Statistics. Madrid, Spain: World Tourism Organization, 1995.

Παραπομπή MLA

World Tourism Organization. Collection of Tourism Expenditure Statistics. Madrid, Spain: World Tourism Organization, 1995.

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