Παραπομπή σε μορφή APA (7η εκδ.)

World Tourism Organization. (1995). Concepts, definitions and classifications for tourism statistics. World Tourism Organization.

Παραπομπή σε μορφή Chicago (17η εκδ.)

World Tourism Organization. Concepts, Definitions and Classifications for Tourism Statistics. Madrid, Spain: World Tourism Organization, 1995.

Παραπομπή σε μορφή MLA (9th εκδ.)

World Tourism Organization. Concepts, Definitions and Classifications for Tourism Statistics. World Tourism Organization, 1995.