Παραπομπή σε μορφή APA (7η εκδ.)

World Tourism Organization. (1995). Global distribution systems (GDBs) in the tourism industry: Draft. World Tourism Organization.

Παραπομπή σε μορφή Chicago (17η εκδ.)

World Tourism Organization. Global Distribution Systems (GDBs) in the Tourism Industry: Draft. Madrid: World Tourism Organization, 1995.

Παραπομπή σε μορφή MLA (9th εκδ.)

World Tourism Organization. Global Distribution Systems (GDBs) in the Tourism Industry: Draft. World Tourism Organization, 1995.