Παραπομπή σε μορφή APA (7η εκδ.)

World Tourism Organization & World Tourism Organization. (1990). Seminar on the integration of tourism in Europe: Istanbul, Turkey, 7-9 May 1990. Organization Mondiale du Tourisme.

Παραπομπή σε μορφή Chicago (17η εκδ.)

World Tourism Organization και World Tourism Organization. Seminar on the Integration of Tourism in Europe: Istanbul, Turkey, 7-9 May 1990. Madrid: Organization Mondiale du Tourisme, 1990.

Παραπομπή σε μορφή MLA (9th εκδ.)

World Tourism Organization και World Tourism Organization. Seminar on the Integration of Tourism in Europe: Istanbul, Turkey, 7-9 May 1990. Organization Mondiale du Tourisme, 1990.